Question

find the value of (2x+7)^2-56​

Answer 1

${\bigstar}$SOLUTION${\bigstar}$

(2x+7)²-56

IDENTITY USED:

$\boxed{\sf{(a+b)² = a² + b² + 2ab}}$

here ,

• a = 2x
• b = 7

➠(2x+7)²-56

➠(2x)² + (7)² + 2(2x)(7) - 56

➠4x² + 49 + 28x - 56

➠$\boxed{\sf{ 4x² + 28x - 7 }}$