Question

Complete the square for the expression. Write the resulting expression as a binomial squared.
x^2 + 4x + ___

A. x^2 + 4x + 4 = (x + 4)^2
B. x^2 + 4x + 16 = (x + 2)^2
C. x^2 + 4x + 4 = (x + 2)^2
D. x^2 + 4x + 16 = (x + 4)^2

Answer 1

http://www.purplemath.com/modules/sqrquad.htm

Answer 2

I have read those, is there a simpler explination somewhere someone knows of?

Answer 3

\[x^2 + 2.2.x + 2^2 = (x+2)^2\]