Question

(84)^2 -(76)^2 the 2 is the square ok​

Answer 1

Your answer is 1280....

Answer 2

${(84)}^{2} - {(76)}^{2}$

$using \: identity \: {x}^{2} - {y}^{2} =(x + y)(x - y)$

$= (84 + 76)(84 - 76)$

= 160 × 8 = 1280