Question

(2x-7) (2x+7) using this identity

Answer 1

$(2x - 7)(2x + 7)$

We know that,

$(x + y)(x - y) = {x}^{2} - {y}^{2}$

So,

$(2x - 7)(2x + 7) = {(2x)}^{2} - {7}^{2}$

${(2x)}^{2} - {7}^{2} = 4 {x}^{2} - 49$