Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 301223: find the value of k which the equation: 3xsquared-kx+7=0 will have two real solutions
please help if you can thanks
Click here to see answer by checkley77(12569)

Question 301299: y=ax^2-8x-3 x is 2.what is the value of "a"?
Click here to see answer by Fombitz(13828)

Question 301320: how to graph y=x^2-6x+11
Click here to see answer by Alan3354(31538)

Question 301417: x^2 - 10x = -23
Click here to see answer by JBarnum(2044)

Question 301419: x^2 - 4x = 2 (solve by completing the square method)
Click here to see answer by JBarnum(2044)

Question 301413: solve 4xsqared-16x+3=0 by using completing the square
Click here to see answer by solver91311(17077)

Question 301421: Find the vertex y=x^2+8x
Click here to see answer by Fombitz(13828)

Question 301465: Solve by factoring and using the principle of zero products. Show all work necessary.
2k2 = -30k - 100

Click here to see answer by checkley77(12569)

Question 301466: An open box is formed from a rectangular piece of cardboard by cutting 2 cm by 2 cm squares from each corner and then folding up the sides and soldering the seams. The length of the original piece of cardboard was 8 cm more than it's width. If the volume of the open box is , what are the dimensions of the metal box?
Use a polynomial equation.
Also, If you could reply with the initial equation, that would help me understand it better.
P.S. If you can not answer this direct it to the Word Problems: Misc Word Problems tutor.
Click here to see answer by checkley77(12569)

Question 301452: Solve using the quadratic formula: 5x^2-16x-84=0

Click here to see answer by checkley77(12569)

Question 301587: Right now we are solving these Quadratic Equations with the zero factor
property. The problem is a word problem:
If the cost, C, for maunufactoring x units of a certain product is given
by find the number of units maufactored at a cost of $12,640.
I already started the problem by solving for x and rewriting the
equation in standard form:
that is my ending result, I now have to factor
the quadratic expression but I am stuck, I use the "diamond method" to help
me factor- I need to know what two numbers have the product of -12600 and have the sum of -15.
I can solve the rest of the problem after You help me find those two numbers.
Click here to see answer by nyc_function(2733)

Question 301518: If a Quadratic equation has a non-perfect square number how do i complete it
Click here to see answer by richwmiller(9144)

Question 301613: The height of a ball in feet is modeled as f(x)=-16x^2+96x, where x is the time in seconds after it is hit. How long is the ball in the air?
Click here to see answer by nerdybill(7009)

Question 301654: Use the quadratic formula to determine the x-intercepts (if any) of the following function. Then evaluate the function for several values of x, and use the resulting points to graph the function. Show your work; and submit your graph through the Dropbox.
f(x) = 2x^2+2
*I am completely lost on this so can you please show the work to anyone that helps me out. I don't just want an easy answer. I'm trying to figure out how its done. Thanks sooooo much in advance!! Be blessed!! *
Click here to see answer by richwmiller(9144)

Question 301751: use the discriminant to determine the number of solutions of the quadratic equation, and whether the solutions are real or complex. Note: It is not necessary to find the roots; just determine the number and types of solutions.
(3)1/2y2 - 4y - 7(3)1/2 = 0
Click here to see answer by richwmiller(9144)

Question 301870: My problem is solving each equation using the quadratic fromula, I know how to do the work, but what i don't know is what formula to use like
-b/2a or -b plus or minus the square root of b squared minus 4 multiplied by a and c over 2a or h=-16t squared plus vt plus s. This is one of the problems
on my worksheet 10x squared minus 6x -1 =0

Click here to see answer by mananth(12270)

Question 301883: An object is propelled vertically upward from the top of a 272-foot building. The quadratic function models the ball's height above the ground, s(t), in feet, t seconds after it was thrown. After how many seconds does the object reach its maximum height? Round to the nearest tenth of a second if necessary.
Click here to see answer by nerdybill(7009)

Question 301937: How do you create a quadratic equation using 2 points already given to you?
Click here to see answer by Alan3354(31538)

Question 301980: 3(7-2y)=9
Click here to see answer by london maths tutor(243)

Question 302081: Use the discriminant to determine whether the given quadratic polynomial can be factored, then factor it if it is not prime. Quadratic Polynomial: -8x^2-3x-5.
Click here to see answer by richwmiller(9144)

Question 302078: Find b^2-4ac
Click here to see answer by richwmiller(9144)

Question 302079: Find two possitive numbers that differ by 2 and have a product of 20. I am looking for an answer involving "+/- the square root of 21".
Click here to see answer by richwmiller(9144)

Question 302077: I have no clue how to solve this problem:
((( -11w^2=-(10w-8))))

Click here to see answer by richwmiller(9144)

Question 302128: This is Imaginary Solutions:
(y-2/3)^2=4/9
Click here to see answer by richwmiller(9144)

Question 302216: y=-x^2+3
write the equation of the axis of symmetry for the function and find whether the vertex is a maximum or a minimum. Then use a table of values to graph the function and circle the coordinates of the vertex on the table.
Click here to see answer by stanbon(57984)

Question 302233: Iam having a horrible time w/quadratic equations especially finding decimals here is the first one: duringthe first part of a trip a canoeist travels 91 mi. at a certain speed. The canoeist travels 15 mi on the second part of the trip at a speed 5 mph slower. The total time for the trip is 4 hours. What was the speed on each part of the trip. The hardest time I am having is to use the quadratic formula and round to the nearest hundreth PLEASE help me understand this. How do you divide quadratic equations to get decimals??
Click here to see answer by stanbon(57984)

Question 302408: SQRT(x)-2x-13=0 move the constant term to the right side of the equation.
Click here to see answer by Alan3354(31538)

Question 302415: SQRT(x)-2x-13=0 set the left side of the equation equal to the positive square root of the number on the right side and solve for x.
Click here to see answer by Alan3354(31538)

Question 302456: Is it possible for 2 different quadratic functions to have the same root?
Click here to see answer by richwmiller(9144)

Question 302413: SQRT(x)-2x-13=0 take the square root of both sides.
Click here to see answer by Alan3354(31538)

Question 302411: SQRT(x)-2x-13=0 Square the coefficiet of the original x term and add it to both sides of the equation.
Click here to see answer by Alan3354(31538)

Question 302484: How do I find the diciminamt of the quadratic equation 2x2-x+1-0

Click here to see answer by richwmiller(9144)

Question 302493: What is the vertex of y=-2x^2-4x+6
Click here to see answer by richwmiller(9144)

Question 302477: a rectangular walkway is 18 feet longer than it is wide. If the area of the walkway is 88 square feet, find the length and the width. (Points :5)

Click here to see answer by mananth(12270)

Question 302579: Factor:
4x(x-1)=15
So far I have 4x^2-4x-15=0
But when it comes to factoring i"m stuck. Is this correct so far?
Click here to see answer by richwmiller(9144)

Question 302577: Principle of Zero:
5x^2+2x=0
Click here to see answer by richwmiller(9144)

Question 302570: Will someone please help me with Evaluate The Exponential Equation For 3 Positive, 3 Neg. Values Of X &x=0 Y=3^-x" Please Show Work?
Click here to see answer by richwmiller(9144)

Question 302481: x2(squared)+5x-24 in vertex form?
Click here to see answer by jim_thompson5910(28717)

Question 302654: find the coordinates of the vertex for the parabola defined by the given quadratic function
f(x)=3x2+18x+8
the vertex is?
(need an ordered pair)
Click here to see answer by Fombitz(13828)

Question 302750: Explain how the solutions to a quadratic equation could be used to find the line of symmetry of the graph of equation.

Click here to see answer by Alan3354(31538)

Question 302782: How would you set up the word problem:
"The larger of two positive numbers if 4 greater than the smaller. Find the two numbers if their product is 77."
Click here to see answer by pinkpeach(1)

Question 302740: Enter the quadratic equation in standard form 2x^2 - 3 = -6x - 2
Click here to see answer by checkley77(12569)

Question 303031: x^2+6xy+9y^2
Click here to see answer by helpnalgebra(91)

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7606..7650, 7651..7695, 7696..7740, 7741..7785, 7786..7830, 7831..7875, 7876..7920, 7921..7965, 7966..8010, 8011..8055, 8056..8100, 8101..8145, 8146..8190, 8191..8235, 8236..8280, 8281..8325, 8326..8370, 8371..8415, 8416..8460, 8461..8505, 8506..8550, 8551..8595, 8596..8640, 8641..8685, 8686..8730, 8731..8775, 8776..8820, 8821..8865, 8866..8910, 8911..8955, 8956..9000, 9001..9045, 9046..9090, 9091..9135, 9136..9180, 9181..9225, 9226..9270, 9271..9315, 9316..9360, 9361..9405, 9406..9450, 9451..9495, 9496..9540, 9541..9585, 9586..9630, 9631..9675, 9676..9720, 9721..9765, 9766..9810, 9811..9855, 9856..9900, 9901..9945, 9946..9990, 9991..10035, 10036..10080, 10081..10125, 10126..10170, 10171..10215, 10216..10260, 10261..10305, 10306..10350, 10351..10395, 10396..10440, 10441..10485, 10486..10530, 10531..10575, 10576..10620, 10621..10665, 10666..10710, 10711..10755, 10756..10800, 10801..10845, 10846..10890, 10891..10935, 10936..10980, 10981..11025, 11026..11070, 11071..11115, 11116..11160, 11161..11205, 11206..11250, 11251..11295, 11296..11340, 11341..11385, 11386..11430, 11431..11475, 11476..11520, 11521..11565, 11566..11610, 11611..11655, 11656..11700, 11701..11745, 11746..11790, 11791..11835, 11836..11880, 11881..11925, 11926..11970, 11971..12015, 12016..12060, 12061..12105, 12106..12150, 12151..12195, 12196..12240, 12241..12285, 12286..12330, 12331..12375, 12376..12420, 12421..12465, 12466..12510, 12511..12555, 12556..12600, 12601..12645, 12646..12690, 12691..12735, 12736..12780, 12781..12825, 12826..12870, 12871..12915, 12916..12960, 12961..13005, 13006..13050, 13051..13095, 13096..13140, 13141..13185, 13186..13230, 13231..13275, 13276..13320, 13321..13365, 13366..13410, 13411..13455, 13456..13500, 13501..13545, 13546..13590, 13591..13635, 13636..13680, 13681..13725, 13726..13770, 13771..13815, 13816..13860, 13861..13905, 13906..13950, 13951..13995, 13996..14040, 14041..14085, 14086..14130, 14131..14175, 14176..14220, 14221..14265, 14266..14310, 14311..14355, 14356..14400, 14401..14445, 14446..14490, 14491..14535, 14536..14580, 14581..14625, 14626..14670, 14671..14715, 14716..14760, 14761..14805, 14806..14850, 14851..14895, 14896..14940, 14941..14985, 14986..15030, 15031..15075, 15076..15120, 15121..15165, 15166..15210, 15211..15255, 15256..15300, 15301..15345, 15346..15390, 15391..15435, 15436..15480, 15481..15525, 15526..15570, 15571..15615, 15616..15660, 15661..15705, 15706..15750, 15751..15795, 15796..15840, 15841..15885, 15886..15930, 15931..15975, 15976..16020, 16021..16065, 16066..16110, 16111..16155, 16156..16200, 16201..16245, 16246..16290, 16291..16335, 16336..16380, 16381..16425, 16426..16470, 16471..16515, 16516..16560, 16561..16605, 16606..16650, 16651..16695, 16696..16740, 16741..16785, 16786..16830, 16831..16875, 16876..16920, 16921..16965, 16966..17010, 17011..17055, 17056..17100, 17101..17145, 17146..17190, 17191..17235, 17236..17280, 17281..17325, 17326..17370, 17371..17415, 17416..17460, 17461..17505, 17506..17550, 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