Question

Evaluate using suitableIdentities.

1. (2a + 7) (2a – 7)​

Answer 1

Answer:

${4a}^{2} - 49$

Step-by-step explanation:

using the identity (a+b)(a-b)=

${a}^{2} - {b}^{2}$

(2a+7)(2a-7)

$( {2a})^{2} - {7}^{2}$

$= {4a}^{2} - 49$