Story problem

Question

A square has an area of 4x^2+12xy+9y^2 square meters. What is the perimeter of the square?

Answer 1

1. (a ± b)² = a² ± 2ab + b²  
2. A = a² , P = 4a

A = (2x)² + 2 · 2x · 3y + (3y)² = (2x + 3y)²
P = 4(2x + 3y) = 8x + 12y