Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 173410: Solve the equation
x(x-3) = 40
Click here to see answer by KnightOwlTutor(293)

Question 173409: Solve the equation
15r^2 = 3r
Click here to see answer by KnightOwlTutor(293)

Question 173408: Write standard form and identify a, b, and c.
4x^2 + 4 = 2x + 3
Click here to see answer by KnightOwlTutor(293)

Question 173412: Express radicals in simplest form.
x^2 + 3 = 52
Click here to see answer by tutorcecilia(2152)

Question 173411: A polygon has 35 diagonals. How many sides does it have?
Click here to see answer by Mathtut(3670)

Question 173411: A polygon has 35 diagonals. How many sides does it have?
Click here to see answer by stanbon(57308)

Question 173481: im having problems with my hwk...we did this along time ago and i just dont remember. i want to know how to find a quadratic equation from a table
Click here to see answer by solver91311(16877)

Question 173531: 5(4-2x)=10x+15
Click here to see answer by Mathtut(3670)

Question 173543: Can someone please help me find the x-intercepts?? I keep getting confused and space.
y = x² + 5x + 1
Click here to see answer by jim_thompson5910(28593)

Question 173547: find a quadratic model for the set of values (-2,-15),(0,-3),(4,-27)
Click here to see answer by Mathtut(3670)

Question 172321: Find the perfect square trinomial whose first two terms are q^2 + 7q
Please help if possible, I am stuck
Click here to see answer by checkley77(12569)

Question 173565: Given that (alpha) is the root of the equation x^2= 2x-1, show that:
(a) (alpha)^3= 3(alpha) -2 ,
(b) (alpha)^4-(alpha)^2= 2(alpha)-2
Click here to see answer by solver91311(16877)

Question 173618: Solve the formula for the specified variable.
v = sqrt (2gE/m), for g
Click here to see answer by nerdybill(6958)

Question 173629: Find the x-intercepts.
y = x^2 + 4
Click here to see answer by vleith(2825)

Question 173630: Find the x-intercepts.
y = x^2 - 4x - 32
Click here to see answer by vleith(2825)

Question 173630: Find the x-intercepts.
y = x^2 - 4x - 32
Click here to see answer by jojo14344(1512)

Question 173628: Graph the equation.
y = x^2 - 2x + 1
Click here to see answer by vleith(2825)

Question 173627: Find the ordered pair for the vertex
y = 2x^2 - 4x + 6
Click here to see answer by jojo14344(1512)

Question 173620: Graph the equation.
y = x^2 - 5
Click here to see answer by jojo14344(1512)

Question 173617: Solve. Round results to the nearest thousandth.
x^2 + 8x - 33 = 0
Click here to see answer by jojo14344(1512)

Question 173626: Tom Quig traveled 280 miles east of St. Louis. For most of the trip he averaged 60 mph, but for one period of time he was slowed to 10 mph due to a major accident. If the total time of travel was 8 hours, how many miles did he drive at the reduced speed?
Click here to see answer by nerdybill(6958)

Question 173621: Solve the formula for the specified variable.
c = sqrt (a^2 + b^2) for A
Click here to see answer by nerdybill(6958)

Question 173624: A picture 11 inches by 15 inches is to be mounted on a piece of matboard so that there is an even amount of mat all around the picture. How wide will the border be if the area of the mounted picture is 285 square inches?
Click here to see answer by nerdybill(6958)

Question 173623: An open box is to be made from a rectangular piece of tin by cutting two inch squares out of the corners and folding up the sides. The volume of the box will be 100 cubic inches. Find the dimensions of the rectangular piece of tin.
Click here to see answer by 303795(595)

Question 173614: Solve the equation
sqrt (2x + 3) - sqrt (x + 1) = 1
Click here to see answer by 303795(595)

Question 173615: Solve the equation
24/x - 2 + 24/x + 2 = 5
Click here to see answer by Alan3354(30993)

Question 173625: Chuck and Dana agree to meet in Chicago for the weekend. Chuck travels 84 miles in the same time that Dana travels 78 miles. If Chuck's rate of travel is 3 mph more than Dana's, and they travel the same length of time, at what speed does Chuck travel?
Click here to see answer by gonzo(654)

Question 173619: A boat can go 33 mph in still water. It takes as long to go 300 miles upstream as it does to go downstream 360 miles. How fast is the current?
Click here to see answer by gonzo(654)

Question 173613: Joe has a collection of nickels and dimes that is worth $6.00. If the number of dimes were doubled and the number of nickels were increased by 6, the value of the coins would be $9.90. How many dimes does he have?
Click here to see answer by gonzo(654)

Question 173612: The perimeter of a rectangle is 62 m. If the width were doubled and the length were increased by 21 m, the perimeter would be 120 m. What are the length and width of the rectangle?
Click here to see answer by ankor@dixie-net.com(15649)

Question 173622: Solve the formula for the indicated letter.
S = (1/3nr^2h + 4nrh), for r
Click here to see answer by ankor@dixie-net.com(15649)

Question 173683:
Click here to see answer by Mathtut(3670)

Question 173734: Create a real life situation that fits into the equation (x+4)(x-7)=0. Do this by a word problem.
I am not good at word problems, can you please help.
Click here to see answer by Mathtut(3670)

Question 173611: The value V, in dollars, of a shopkeeper's inventory software program is given by V= -40t + 350, where t is the number of years since the shopkeeper first bought the program. Find the value of the software after 0 yr, 4 yr, and 6 yr.
Click here to see answer by Mathtut(3670)

Question 170443: Expand and simplify:
a. 6(x+2)+(x+2)
b. 5(2x-1)-3x(2x-1)
Click here to see answer by HyperBrain(694)

Question 173804: Solve. Try factoring first. If factoring is not possible or is difficult, use the quadratic formula.
2x^2 + 8 = -1
Click here to see answer by vleith(2825)

Question 173803: Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, its height is given by the formula h = 432 - 16t^2. How many seconds will it take for the rock to hit the ground (h=0)?
Could it be 5.2 seconds?
Click here to see answer by vleith(2825)

Question 173805: Solve. Round results to the nearest thousandth.
7x^2 - 6x - .4255 = 0
Click here to see answer by vleith(2825)

Question 173802: Solve the equation.
24/(x-2)+24/(x+2)=5
Click here to see answer by Alan3354(30993)

Question 173836: My algebra 2 teacher has the equation . I solved it by moving the -2x^2 to the right side (less work) to get . He solved it (more work) by moving 16x + 28 to the left side to get . We both get the same roots and the same axis of symmetry, but different vertices. I get a minimum, my parabola is "upright" while he gets a maximum because his is upside down.
What is the rule? He says he always solves for a positve "a", but the book just says a cannot = 0.
Help!
Click here to see answer by solver91311(16877)

Question 173851: Evaluate (-8.3)(4.7)
Your help is Apreciated!Thanks.
Click here to see answer by stanbon(57308)

Question 173850: Evaluate,I need help..Can someone please show me how to do this step by step?
1/3+3/4 divided by 4/12-5/6
Thank You SO much! =D
Click here to see answer by stanbon(57308)

Question 173855: Hi struggling mom here--trying to help daughter with homework> we need help with the following quadraic equation if possible thanks!
x^2-2x+1=196
Many thanks,
Susan
slelsea@aol.com
Click here to see answer by solver91311(16877)

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