







The center and radius of a circle 
20150206 

From ariana: I need to find the center and the radius of this circle. I don't know how to put 9/2
than square it into a fraction.
x^2 + 2x + y^2 +9y=5 Answered by Penny Nom. 





Completing the square 
20091002 

From christopher: how do i find the factors of x^2+3x+2 by completing the square ? Answered by Robert Dawson. 





The inverse of F(x)=x^26x+13, for x>3 
20090726 

From Juan: The function F is given by F(x)=x^26x+13, for x>3.
A. Write F(x) in the form (xa)^2+b
B.Find the inverse function F^1
C.State the domain of F^1 Answered by Penny Nom. 





Completing the square 
20090616 

From rebecca: Find the roots of the equation by Completing the square. Express your answer in exact form and in decimal form to 2 decimal places.
a) x(squared)+10x+23
b)3y(squared)+12y+3 Answered by Stephen La Rocque. 





Completing the square 
20090427 

From Daniel: I tried following an example of yours but I still couldn't figure it out.
Here is my question,
2x^2  6x + 1 = 0.
Any help would be greatly appreciated. Answered by Stephen La Rocque. 





Factor 9x^2 + 6x + 4 
20081121 

From Jonah: how can i solve this by factoring: 9x^2 + 6x + 4 Answered by Harley Weston. 





A rectangle word problem 
20080410 

From Nick: A rectangle is twice as long as it is wide. If the length and width are both increased by 5cm, the resulting rectangle has an area of 50cm^2. Find the dimensions of the original. Answered by Penny Nom. 





Complete the square 
20080409 

From jessica: can you check my answer please thanks
f(x)=2x^24x+5
I got 2(x+2)^23 for when it asked to simplfy it to standard form of a quadratic
equation Answered by Stephen La Rocque. 





Complete the square 
20080409 

From jessica: Use the technique of completing the square to put f(x)= 2x^24x+5
in the form f F(x)= a(xh)^2+k were h,k=vertex of the parabola.
identify the coordinate (h,k)of the maximum or minimum point
of the associated parabola Answered by Penny Nom. 





More on completing the square 
20071129 

From June: x^2  6x = 16 I found you already had this question but the answer you gave did not help me to explain how to answer the problem for my daughter. I do not understand how to complete the square for this paticular question and the example you showed did not help. I would appreciate any further help you could give me. Answered by Penny Nom. 





Finding the center of an ellipse 
20070620 

From Sima: find the center of the ellipse with the equation 3x^2 +4y^2+18x32y5=0 Answered by Penny Nom. 





Solving x^23x+5=0 
20011130 

From Katy: How do you find the solution to x^{2}3x+5=0? Answered by Penny Nom. 





The Quadratic Formula 
19990122 

From Eric Morgan: Hi my name is Eric Morgan and I m in 8th Grade honors math (middle) and I'd like to know how to prove the quadratic formula bħsqrt of b(a)(c)over 2(a) Answered by Penny Nom. 

