Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 114600: x^=-11
Click here to see answer by checkley71(8403)

Question 114521:
f(x)=-x^+4x-3

Graph y=f(x)
Show x-and y-intercepts and vertex on the graph
I actually thought y was f(x) from how it was explained in class, where am I off on this?
Click here to see answer by checkley71(8403)

Question 114605: For this question i have to sketch and label a graph, show all calculations and leave them in either factored or vertex form. I also have to keep 4 decimal places through my solutions and then round final answer to one decimal place. The question is :
A farmer has $2400 to spend on two rectangular pastures as shown to the right. (the diagram is of 2 identical shaped rectangles attatched by one of the length sides). The local contractor will build the fence at a cost of $6.25/m. What is the largest total area the farmer can have fenced for that price??

Click here to see answer by ankor@dixie-net.com(22740)

Question 114533: Rita rows 12km upstream and 12km downstream in 3 hours. The of her boat in still water is 9km/hr. Find the speed of the stream.
Click here to see answer by ankor@dixie-net.com(22740)

Question 114676: Solve by using the quadratic formula:
Z squared + 4z + 1 = 0
Click here to see answer by jim_thompson5910(35256)

Question 114678: Solve by using the quadratic formula:
9z squared + 12z + 4 = 0
Click here to see answer by jim_thompson5910(35256)

Question 114666: 10(�x � 7) + 20 = �5(2x + 4)
Click here to see answer by jim_thompson5910(35256)

Question 114663: 7x � 5 + 3x = 6 + x � 10
Click here to see answer by jim_thompson5910(35256)

Question 114677: John owns a hotdog stand. He has found that his profit is represented by the equation ,, where x is the number of hotdogs. How many hotdogs must he sell to make a profit?
P(x)=x^2+56x+73
Choices:
45 hotdogs
28 hotdogs
56 hotdogs
73 hotdogs
Thank you.
Click here to see answer by edjones(8007)

Question 114667: 7x(3x+4)=8(2x+5)+13
Click here to see answer by edjones(8007)

Question 114519: f(x)=-x^2+4x-9
Find the vertex
What is the extremum value of the function?
Click here to see answer by HyperBrain(694)

Question 114734: Graph the inequality.
y is equal to or greater then 1

Click here to see answer by MathLover1(20849)

Question 114734: Graph the inequality.
y is equal to or greater then 1

Click here to see answer by jim_thompson5910(35256)

Question 114744: Graph by first solving for y.
x � 3y = 9

Click here to see answer by jim_thompson5910(35256)

Question 114788: Write the equation of the line passing through (�3, �5) and (3, 0).
Click here to see answer by jim_thompson5910(35256)

Question 114681: An L- shaped sidewalk from the parking lot to a memorial is as follows:
The distance directly across the grass to the memorial is 650 ft.
The distance to the corner of the "L" is 600 feet.
Find the distance from the corner of the "L" to the memorial.
Click here to see answer by ankor@dixie-net.com(22740)

Question 114900: consider the sum of squares x^2+9.if this sum can be factored, then there are intergers m and n such that x^2+9=(x+m)(x+n). write two equationa relating the sum of m and n to the coefficients in x^2+9.
show that there are no intergers m and n that satisfy both equations you wrote in part (a). what can you conclude?
Click here to see answer by stanbon(75887)

Question 114913: Why are there usually two solutions in quadratic equations?
Click here to see answer by Edwin McCravy(20054)

Question 114388: Solve the following quadratic equation.
4x squared = 13x + 12
Click here to see answer by jim_thompson5910(35256)

Question 114970: find y intercept and vertex: y = x^2 - 4x + 5
Click here to see answer by HyperBrain(694)

Question 115226: I do not think my question posted so I am going to try again. Here is the equation 3x^2-2x+1=0. I am confused by my answer: -2 +/- sqr rt -8,over 6. Is this the correct answer and if so do I leave it or break it down further?
Click here to see answer by jim_thompson5910(35256)

Question 115257: 17000=130000+D/(10.83) I don't how to seperate variable and can I multiply both sides by 10.83 after moving D, or do I have to do something else first?
Click here to see answer by stanbon(75887)

Question 115318: I am having problems fiquiring out how i(1+i)^3 *(1-i) is equal to -4. I am required to show work... When I type the equation into my calculator it comes out -4. How so?
Thanks,
Mike
Click here to see answer by stanbon(75887)

Question 115339: the directions on this work sheet is use the quadratic formula to solve each equation and the equation is m^2+5m-6=0 i dont understand how to figure it out so if you could give me directions so that i know how to get the answer i would be greatly appriciated! thanks
Click here to see answer by aka042(26)

Question 115468: factor
8x^3y^5+16y^3x^5-40x^4y^4

Click here to see answer by jim_thompson5910(35256)

Question 115472: find the axis of symentry of the parabola defined by the given quadratic function.
f(x)= x^2+5
Click here to see answer by scott8148(6628)

Question 115642: Algebra 1 chapter 9 Resource Book lesson 9.3 Practice A
I am having dificulty trying to figure out the coordinates to a problem that contains an a, b, c and even more when b and c are sometimes missing.
Find the coordinates of the vertex.
1. y= 3x�
2. y= 5x�-1
3. y= x�+6x

Click here to see answer by vertciel(183)

Question 115684: I have a test tomorrow and am having a lot of trouble with quadratic equations. i understand some things, but others do not make sense at all. below are 3 problems that i do not understand how to solve. if you could solve the problems and show the steps, that would really help me a lot.
1. 3x^2 + 9 = 0
2. 2x^2 - 14x - 10 = 0
3. -2u^2 + 6 = 3u^2 - 10u

i attempted problem one and the answer i ended up with was x = the square root of 3. i thought for those types of problems there were supposed to be two answers though, like x + sq. root three and x equals (another number)
Click here to see answer by jim_thompson5910(35256)

Question 115710: x^2-x-13=0
Click here to see answer by jim_thompson5910(35256)

Question 115722: I have a test tomorrow and am having a lot of trouble with quadratic equations. i understand some things, but others do not make sense at all. below are 3 problems that i do not understand how to solve. if you could solve the problem and show the steps, that would really help me a lot.
1. 2x^2 - 14x - 10 = 0 (must be solved by factoring or by completing the square, cannot use the quadratic formula)

Click here to see answer by jim_thompson5910(35256)

Question 115709: 8=1-7x^2
Click here to see answer by Gator Tutoring(5)

Question 115783: A projectile is thrown upward so that the its distance above the ground after t seconds is h(t)=-16t^2+308t
After how many seconds does it reach its maximum height?
What is that maximum height?
The area of a square is numerically 12 more than the perimeter. Find the length of the side?
These two problems are really hard can anyone help.
Click here to see answer by bucky(2189)

Question 116123: I have tried to do this equation but I'm having trouble with it. Can you please help me? Solve and graph the equation.
y= -3x^2 + 6x - 2
Click here to see answer by solver91311(24713)

Question 116122: Please can you help me with this equation, I've been working it out but I'm not able to get the right answer. Graph and solve the equation.
y= x^2 - 4
Click here to see answer by bucky(2189)

Question 116013: Find a quadratic equation with roots (4 + i) and (4 - i).
Click here to see answer by ankor@dixie-net.com(22740)

Question 116197: How do you find if an equation has 2 real number solutions, 1 real solution or no real-number solutuons? an example is x^2-6x+c=0
Click here to see answer by jim_thompson5910(35256)

Question 116449:
The length of a rectangle is four times the width. The area is 144 in.^2. Find the length and the width. Show your work.
Click here to see answer by checkley71(8403)

Question 116458: THE CHART BELOW SHOWS THE NUMBER OF BOOKS READ IN A MONTH IN EACHOF MRS. GRAHAM'S LANGUAGE ARTS CLASSES.

1ST PERIOD 68 2ND PERIOD 72 3RD PERIOD 53 4TH PERIOD 77 5TH PERIOD 57
WHAT IS THE MEAN NUMBER OF BOOKS READ PER CLASS?
THE MEDIAN NUMBER OF BOOKS LIES IN WHAT CLASS PERIOD?
DOES A MODE EXIST FOR THIS SET OF DATA? WHY OR WHY NOT.
Click here to see answer by checkley71(8403)

Question 116500: Cindy averaged 60 mph on a trip to Chicago. Returning home she took a more scenice route and averaged 50 mph. The return trip was 2 hours longer and was 30 miles farther. How long did it take Cindy to drive to Chicago?
Click here to see answer by stanbon(75887)

Question 116503: The sum of angles of a triangle is 180 degrees. The first angle is 12 degrees more than half the second angle. The third angle is 19 degrees less than 4 times the second angle. What is the measures of all three angles?
Click here to see answer by princess08(3)

Question 116737: quadratic function in standard from of
(0,3) (1,-4) (2,-9)
Click here to see answer by stanbon(75887)

Question 116766: Find a quadratic equation with the given roots: -1/4 and 1/5.
Click here to see answer by stanbon(75887)

Question 116762: Hi I need help with a few math problems. I was sick when the teacher gave us the lesson. Im really confused. I will try to explain the problems as best I can.
First problem is Solved By using the Quadratic Formula
1) 4p^2 - 7p = -3
I have no idea what to do in this situation. I know you prefer if I try. But I honestly dont know where to start.
The second Problem is Findind the vertex.
y=x^2 + 2x + 2
Im pretty sure I did this wrong.
I got -1 but im not sure how I got it. The teacher marked it wrong, prolly cause I didnt show all the steps. (shes givin us an opportunity to correct problems)
The third problem is For the parabola
y=x^2 - 6x +8
Find the x intercepts
After doing the work (i prolly did it wrong) I got (x-4)(x-2)=0
and my final answer was x=2, x=4
If you could show the steps to this problem, as well as the others I would really appreciate it. Again any help you guys could give me I would really appreciate it.
Click here to see answer by jim_thompson5910(35256)

Question 116754: A stamp collection consists of 5, 13, and 18 cent stamps. The number of 13 cent stamps is one less than twice the number of 5 cent stamps. The number of 18 cent stamps is five more than the number of 13 cent stamps. The total value of all the stamps is $2.60. Find the number of 13 cent stamps in the collection.
Here is what I have so far:
.05x + .13(2x+1) + .18((2x+1)-5)=2.60
Am I anywhere close? Can you help me solve?
Click here to see answer by edjones(8007)

Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305, 1306..1350, 1351..1395, 1396..1440, 1441..1485, 1486..1530, 1531..1575, 1576..1620, 1621..1665, 1666..1710, 1711..1755, 1756..1800, 1801..1845, 1846..1890, 1891..1935, 1936..1980, 1981..2025, 2026..2070, 2071..2115, 2116..2160, 2161..2205, 2206..2250, 2251..2295, 2296..2340, 2341..2385, 2386..2430, 2431..2475, 2476..2520, 2521..2565, 2566..2610, 2611..2655, 2656..2700, 2701..2745, 2746..2790, 2791..2835, 2836..2880, 2881..2925, 2926..2970, 2971..3015, 3016..3060, 3061..3105, 3106..3150, 3151..3195, 3196..3240, 3241..3285, 3286..3330, 3331..3375, 3376..3420, 3421..3465, 3466..3510, 3511..3555, 3556..3600, 3601..3645, 3646..3690, 3691..3735, 3736..3780, 3781..3825, 3826..3870, 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