Question

Comparing (2x + 5)² with (a + b)² we have a = ____ and b = ____, (a + b)² = __________ (2x + 5)² = (2x)² + ____ + 5² = ___________​

Answer 1

• a=2x
• b=5

(a + b)²= a²+2ab+b²

• (2x + 5)² = (2x)² + 2(2x)(5)+ 5² = 4x²+20x+25