Question

Evaluate (7x+2) (7x-2)

Answer 1

( 7x + 2) (7x - 2).

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

(7x + 2) (7x - 2) = (7x)² - 2²

= 49x² - 4

Answer 2

7X(7X-2)+2(7X-2)

49X^2 - 14X+14X-4

(•cutting -14x+14x)

49x^2-4