Questions on Algebra: Quadratic Equation answered by real tutors!

Tutors Answer Your Questions about Quadratic Equations (FREE)

Question 103590: Solve. (x + 2)^2 = 7
Click here to see answer by Fombitz(13828)

Question 103593: Identify the axis of symmetry, create a suitable table of values, then sketch the graph (including the axis of symmetry).
y = –x^2 + 3x – 3

Click here to see answer by MathLover1(6625)

Question 103585: Solve. (x + 4)^2 = 16
Click here to see answer by Fombitz(13828)

Question 103618: x^2-4x+2 = 0
5x^2 - 2 = 2x
3x^2 - 6x = 2

Click here to see answer by MathLover1(6625)

Question 103617: Solve by completeing square
x^2=4-7x
3x^2-x-x-2=0
If the square of 2 less than an interger is 16, find the number(s)?
Click here to see answer by MathLover1(6625)

Question 103591: The height h in feet of an object after t seconds is given by the function
h = –16t^2 + 40t + 10.
How long will it take the object to hit the ground? Round your answer to the nearest thousandth

Click here to see answer by jim_thompson5910(28536)

Question 103616: Solve equations for x

(x-3)^2=10
(x+2)^2 = 16
Click here to see answer by MathLover1(6625)

Question 103646: I am having a hard time with this one can someone please help me?
Its a multiple choice question but I am having a hard time.
Solve by using the quadratic formula. 3x^2 = 11x + 4
A) -1/3,4
B) 1/3,-4
C) -1/4,3
D) 1/4,-4

Click here to see answer by stanbon(57282)

Question 103662: Find the constant term that should be added to make the following expression a perfect-square trinomial. x^2 + 2x
Click here to see answer by Fombitz(13828)

Question 103666: Solve. x^2 – 10x + 16 = 0
Click here to see answer by Fombitz(13828)

Question 103667: The demand and supply equations for a certain item are given by
D = –5p + 40 S = –p^2 + 30p – 8
Find the equilibrium price
Click here to see answer by stanbon(57282)

Question 103659:
Click here to see answer by jim_thompson5910(28536)

Question 103659:
Click here to see answer by nicole_calvento27(1)

Question 103742: My problem is to find the number c such that the vertex of f(x)=x^2+8x+c lies on the x-axis.
Click here to see answer by stanbon(57282)

Question 103586: Please help me solve.
The length of a rectangle is 1 cm more than 2 times its width. If the area of the rectangle is 76 cm^2, find the dimensions of the rectangle to the nearest thousandth.
Click here to see answer by scott8148(6628)

Question 103749: My problem is if the vertex of f(x)=x^2+bx+c is at (2,4), find b and c.
Click here to see answer by scott8148(6628)

Question 103749: My problem is if the vertex of f(x)=x^2+bx+c is at (2,4), find b and c.
Click here to see answer by edjones(7569)

Question 103792: My question is if the vertex of f(x)=-x^2+bx+8 has y-coordinate 17 and is in the second quadrant, find b.
Click here to see answer by jim_thompson5910(28536)

Question 103792: My question is if the vertex of f(x)=-x^2+bx+8 has y-coordinate 17 and is in the second quadrant, find b.
Click here to see answer by edjones(7569)

Question 103811: Hello Tutors,
For some reason I can not figure these things out! I know that the Quadratic Formula is:
x = -b±√b2 – 4ac / 2a
But I can't get plugging the problem x^2 - 3x = 7x -2 into the formula and solve. Can someone please help?????
Further directions from my professor are as follows:
Make sure that your work is demonstrating the solving method given in the instructions. Use the Insert and Symbols menus in Word to present the radical √ and plus/minus ± symbols. Remember that radicands must be enclosed within [ ]. Typing your work vertically is preferred but optional. If you choose to type horizontally, make sure you are appropriately using grouping symbols.

Click here to see answer by ptaylor(2048)

Question 103833: square root 7x+29=x+3
Click here to see answer by jim_thompson5910(28536)

Question 103815: Hello Tutors,
Here is another Quadratic formula problem I seriously need your help on.
Directions from the Professor are as follows;
Make sure that your work is demonstrating the solving method given in the instructions. Use the Insert and Symbols menus in Word to present the radical √ and plus/minus ± symbols. Remember that radicands must be enclosed within [ ]. Typing your work vertically is preferred but optional. If you choose to type horizontally, make sure you are appropriately using grouping symbols.
Here is the Problem:
Solve by using the Quadratic Formula;
x^2 - 7x - 1 + -7 Thank You!
Click here to see answer by jim_thompson5910(28536)

Question 103812: Hello Tutors,
For some reason I can not figure these things out! I know that the Quadratic Formula is:
x = -b±√b2 – 4ac / 2a
But I can't get plugging the problem x^2 - 3x = 7x -2 into the formula and solve. Can someone please help?????
Further directions from my professor are as follows:
Make sure that your work is demonstrating the solving method given in the instructions. Use the Insert and Symbols menus in Word to present the radical √ and plus/minus ± symbols. Remember that radicands must be enclosed within [ ]. Typing your work vertically is preferred but optional. If you choose to type horizontally, make sure you are appropriately using grouping symbols.

Click here to see answer by jim_thompson5910(28536)

Question 103813: Let me try this again as I did not recieve the normal confirmation page that this was sent to the wonderful tutors here.
Directions from my Professor are as follows:
Make sure that your work is demonstrating the solving method given in the instructions. Use the Insert and Symbols menus in Word to present the radical √ and plus/minus ± symbols. Remember that radicands must be enclosed within [ ]. Typing your work vertically is preferred but optional. If you choose to type horizontally, make sure you are appropriately using grouping symbols.
On Pg: 583 of our textbook it shows the quadratic formula. But I somehow am messing up to the point I am so confused I don't know where to begin.
Here is the Problem:
Solve by using the Quadratic Formula;
x^2 - 3x = 7x - 2 Thank You!
Click here to see answer by jim_thompson5910(28536)

Question 103658: Solve by completing the square. 2x^2 – 6x – 3 = 0
Click here to see answer by ankor@dixie-net.com(15645)

Question 103658: Solve by completing the square. 2x^2 – 6x – 3 = 0
Click here to see answer by jim_thompson5910(28536)

Question 103806: My question is given the equation s=-16t^2+initial velocity x t+initial height, a rocket is fired upward from ground level with an initial velocity of 1600 feet/sec. When does the rocket reach its maximum height and how high is it at that time?
Click here to see answer by stanbon(57282)

Question 103931: Can someone Please, Please, Please help me solve tis problem by using the Quadratic Formula! I am desperite! Thank You!
Solve by Using the Quadratic Formula:
x^2 - 7x - 1= -7
Click here to see answer by jim_thompson5910(28536)

Question 103947: Tutor,
I was wondering if you could help me with this problem?
Find the equation and identify the axis of symmetry, create a suitable table for values, and graph.
y = x^2 - 5x + 3
I am not sure how to solve this problem I think I am making a mistake somewhere along the line. If you could help I would appreciate it. Thanks.
Click here to see answer by stanbon(57282)

Question 103942: what values for x must be excluded in the following fraction
7 over
x-9
a. 0
b. -9
c. 9
d. none
Click here to see answer by doukungfoo(195)

Question 103942: what values for x must be excluded in the following fraction
7 over
x-9
a. 0
b. -9
c. 9
d. none
Click here to see answer by jim_thompson5910(28536)

Question 103981: Could some one please help me solve this equation.

Click here to see answer by jim_thompson5910(28536)

Question 104025: I am stuck on this word problem would you be able to help me work it out?
A ball is thrown upward from the roof of a building 100 m tall with an initial velocity of 20 m/s. When will the ball reach a height of 80 m?
This problem has me confused I am not sure where to begin. Thanks for your help.
Click here to see answer by ankor@dixie-net.com(15645)

Question 104059: Is the following trinomial a perfect square?
x^2 + 18x + 81

Click here to see answer by scott8148(6628)

Question 104058: Find the x-intercepts.
y = x^2 + 5x + 2

Click here to see answer by HyperBrain(694)

Question 104057: Solve by completing the square.
x^2 = 5x + 2

Click here to see answer by HyperBrain(694)

Question 104056: Solve. x^2 + 7x – 1 = 0
Click here to see answer by HyperBrain(694)

Question 104063: Q.Solve for x

(b-c)x^2 + (c-a)x + (a-b)= 0
Click here to see answer by stanbon(57282)

Question 104063: Q.Solve for x

(b-c)x^2 + (c-a)x + (a-b)= 0
Click here to see answer by HyperBrain(694)

Question 104023: Tutor,
I have one last problem and I am having difficulty getting the answer. I think I am wrong on the negatives and possitives. My graph does not look right.
Indetify the axis of symmetry and create a table of values and graph.
y= -x^2 + 6x - 2
My answer does not look right to me could you please help me with this? Thank you in advance.
Click here to see answer by stanbon(57282)

Question 104066: A=1/2h for h
Click here to see answer by stanbon(57282)

Question 104070: Find the axis of symmetry.
y = x^2 + 5x – 7

Click here to see answer by stanbon(57282)

Question 104074: Solve by completing the square.
x^2 + 2x – 8 = 0

Click here to see answer by jim_thompson5910(28536)

Question 104072: Solve 5(x – 2)^2 = 3
Click here to see answer by jim_thompson5910(28536)

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