Questions on Algebra: Quadratic Equation answered by real tutors!

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Question 685208: Please help me with this problem!
For the given correspondence, write the domain and the range. Then determine if it is a function.
(0.7),(9,-7),(-8,4),(4,4),(-3,1)
a domain[-7,-4,-1,4,7] range [-8,-3,0,4,9] no function
b domain[-8,-8,0,4,9] range [-7,-4,-1,4,7] no function
c domain[-8,-8,0,4,9] range [-7,-4,-1,4,7] yes it is a function
d domain[-7,-4,-1,4,7] range [-8,-3,0,4,9] yes it is a function
Click here to see answer by lynnlo(4176)

Question 348454: please help me to solve this problem. "Find two real numbers whose sum is 18 and whose product is a minimum." tnx
Click here to see answer by hairejem@gmail.com(1)

Question 685702: sailor raju covered a distance of 8km in 1hr and 40 minutes down stream and returns to the starting point.If the speed of the stream is 2km/hr,find the speed of the boat in still water.
Click here to see answer by mananth(16946)

Question 685893: Please help me with this question. I'm getting really confused with the 3x. I' not sure where to start.
Find all of the exact solutions to the following equation. (Use the parameter k as necessary to represent any integer.)
cos(3x) =1/2

Click here to see answer by lwsshak3(11628)

Question 685909: write a quadratic equation function in the form f(x)=ax^2+bx+c for the parabola that has the same shape as the graph of f(x)=-5x^2,but which has a maximum value of 6 at x=2
Click here to see answer by mathgotserved(25)

Question 685998: Solve for x by completing the square
2x^2+20=4x
Click here to see answer by stanbon(75887)

Question 685998: Solve for x by completing the square
2x^2+20=4x
Click here to see answer by funmath(2933)

Question 686003: use the quadratic formula to solve x2 -10x +25 = 12
Click here to see answer by ReadingBoosters(3246)

Question 686131: two cars traveled in opposite directions from the same starting point. The rate of one car was 10km less than the rate of the other. After 4 hours the cars were 600km apart. Find the rate of each car
Click here to see answer by josmiceli(19441)

Question 686234: solve the equation using the quadratic formula method:3a^2x^2-abx-2b^2=0

Click here to see answer by lwsshak3(11628)

Question 686439: Hi i need to show steps on how to do this problem and the problem is 4x^2-3x+10=4. Can you show me step by step and explain clearly in detail to show all steps. thanks
Click here to see answer by lynnlo(4176)

Question 686484: Determine whether the given quadratic function has a minimum value or maximum value. Then find the coordinates of the minimum or maximum point.
f(x) = -3x^2 + 9x

I got max: 3/2, 27/4
Click here to see answer by stanbon(75887)

Question 686537: whats the solution to x^2 +4x+19=0?
Click here to see answer by jim_thompson5910(35256)

Question 686537: whats the solution to x^2 +4x+19=0?
Click here to see answer by josh_jordan(263)

Question 686696: I am not understanding how to start this word problem. We are supposed to be using quadratic equations. The problem is.....

The length of a rectangle is 1cm more than twice it's width and 2cm less than the length of the diagonal of the rectangle. Find the dimensions of the rectangle.
I think the diagonal part is confusing me because we have never solved a problem with diagonal before.
Click here to see answer by lwsshak3(11628)

Question 687135: graph : f(x)= 1/3X^2
Click here to see answer by jim_thompson5910(35256)

Question 687298: I have the vertex (2,-3) and one point (-1,3)
I need to write a quadic formula
also I have the vertex (-1,6) and the y intercept =3
and I have to write a quadric formula for that also.
Can you tell me the steps to writing a formula from this information?
Thank you!

Click here to see answer by stanbon(75887)

Question 687413: How do I solve this? -28x^2=4x. How do I make it equal 0?
Its my last question on my hw n if I get this wrong I have to start all over again. :( I think I may have an answer but I dnt want to push enter n it say I got it wrong n have to start over for the 3rd time
Click here to see answer by jim_thompson5910(35256)

Question 687575: Please solve the following quadratic equation for x:
Click here to see answer by josh_jordan(263)

Question 687613: Hello, I am in need of help on a Quadratic Equation Question. The question is as follows: "Use the model you created for the question above to determine the intial velocity necessary for the ball to clear the tree. Write the equation in standard form, then complete the square to show the maximum height of 11 m." The model I solved for is, "h = 4.52t^2 + .41t + 5.92." What do I do? Thanks a ton in advance!! :)
Click here to see answer by stanbon(75887)

Question 687718: Find the equation of the parabola that passes through the points (2,3) and (10,3) and has a max value of y=35.
Can you please help me out? thanks in advance
Click here to see answer by MRperkins(300)

Question 687792: (4x+9)(15x^2-7x-2)=0
Click here to see answer by ReadingBoosters(3246)

Question 687790: 12v^2-5v=2

Click here to see answer by ReadingBoosters(3246)

Question 687803: Use the Quadratic Formula to solve the equation.
�x^2 + 7x = 8
Help please. Thanks!
Click here to see answer by ReadingBoosters(3246)

Question 687913: im not sure how to factor 1-2(x+5)^2-6=15
Click here to see answer by fcabanski(1391)

Question 687913: im not sure how to factor 1-2(x+5)^2-6=15
Click here to see answer by ReadingBoosters(3246)

Question 687921: (w-3/2)squared = 7/4
Click here to see answer by ReadingBoosters(3246)

Question 688089: Solve the quadratic equation by the square root property( 5x+ 2 )^2=5
Click here to see answer by lwsshak3(11628)

Question 688189: How do you solve the quadratic equation
16x^2-21=0
Click here to see answer by stanbon(75887)

Question 688255: write the following equation in standard form: 4x^2-5x=2
Click here to see answer by jim_thompson5910(35256)

Question 688315: i need to determined the values of the quadratic equation (-2,-1,0,1,2)
1-F(x)=1/2x^2 - 4
2-F(x)=(x+4)^2 - 1
Click here to see answer by MathLover1(20849)

Question 688601: Solve this quadratic funtion question x2+ 12x -64=0
I am stuck:
a. Move the constant term to the right side of the equation:
x2 + 12x = 64
b. Multiply each term in the equation by four times the coefficient of the x2 term:
4x^2 + 48x = 256
c. Square the coefficient of the original x term and add it to both sides of the equation:
I am stuck here. I hope this is correct thus far.
d. Take the square root of both sides:
e. Set the left side of the equation equal to the positive square root on the right side and solve for x:
f. Set the left side of the equation equal to the negative square root on the right side and solve for x:
Click here to see answer by lwsshak3(11628)

Question 688669: The sum of the area of two squares is 89 square centimeters. The length of a side of the larger square is 3 cm more than the length of a side of the smaller square. find the dimensions of each square.

Click here to see answer by sachi(548)

Question 689005: I do not know how to use the quadratic Formula, when I do my equation I seem to forget a part that my anwser does not make sense. My equation is m2 + 22m + 121.
Click here to see answer by solver91311(24713)

Question 689024: How do you solve (m+5)^4 - 4(m+5)^2+4=0 ? Thanks, Gio
Click here to see answer by solver91311(24713)

Question 689216: I need help in setting up an equation. The problem says the longer leg of a right triangle is 3 cm less than 5 times the shorter leg. The hypotenuse is 3 cm longer than the shorter leg. Find the length of the shorter leg. a^2 + b^2 = c^2 or in this case b^2 + (5b - 3)^2 = (5b + 3)^2. I am having problems once I get the equation to 26b^2 - 30B +9 = 25b^2 + 30B +9. Can someone help me from that point or tell me where I went wrong in setting the problem up?
Click here to see answer by KMST(5328)

Question 557167: Determine the abscissae of the maxima, minima and inflection points.
y = x^4 + 6x^3 - 5
The answer is supposed to be: Minimum at x point = -9/2, inflection points at x=0 and x=-3
Help me please.
Click here to see answer by gbnbgb(1)

Question 689501: use the discriminant to determine whether the given equation has two rational solutions one rational solution two irrational solutions or two imaginary solutions do not actually solve 4 + 6x2 = 7z
Click here to see answer by solver91311(24713)

Question 689809: compute the discriminant. Then, determine the number and type of solutions for the given equation. x^(2)+10x+13=0
Click here to see answer by nerdybill(7384)

Question 689851: The digit of a two-digit number adds up to 14. the number itself is 11 less than the sum of the squares of the digits. find the number

Note: I worked out that the two numbers are 5 and 9 by random guessing and substituting the numbers into the question. but I don't know the correct way to set out the working.
Click here to see answer by vleith(2983)

Question 689913: I need help solving these problems, I do not want the answers given to me, I want to learn step by step. Please Help.!
Show all Work
1. Solve: y^2 + 7x = 30
2. Solve: x^2 + 7 = -8x
3. Solve: x^2 � 26x + 48 = 0
4. Solve: x^2 - 4x = 32
5. Solve: w(6w + 12) = 0
6. Solve: y^2 + y = 30
7. Solve: (a � 5)(a + 3) = 0
am having big problems with 1 and 2. And for number 7 can I use FOIL?
Please answer me ASAP! Thank you very much. :)
Click here to see answer by Alan3354(69443)

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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