Posted by Anonymous on Tuesday, April 9, 2013 at 4:22pm.
A small painting has an area of 400 cm^2. The length is 4 more than 2 times the width. Find the dimensions of the painting. Solve by completing the square. Round answers to the nearest tenth of a centimeter.

Algebra  rbowh, Tuesday, April 9, 2013 at 4:31pm
let x = width
2x + 4 = length
A = lw
A = x(2x + 4)
400 = x(2x + 4)
400 = 2x^2 + 4x
200 = x^2 + 2x
x^2 + 2x = 200
do you know how to complete the square? 
Algebra  Anonymous, Tuesday, April 9, 2013 at 4:31pm
Yes, I know how to do it from now. Thank you.

Algebra  rbowh, Tuesday, April 9, 2013 at 4:33pm
Great!

Algebra  Anonymous, Wednesday, February 17, 2016 at 7:49pm
no i don't understand still