Question

(3x+7)^2 -84x =(3x-7)^2

Answer 1

Answer:

Step-by-step explanation:

(3x+7)^2-84x=(3x+7)

So 9x^2+49+42x-84x =9x^2 +49 -42x

=42x-84x=-42x

=42x+42x-84x=0

Hope it will help u

Answer 2

$We know that \\ \\ (a + b)^2 - (a - b)^2 = 4ab \\ \\ \\ Therefore, \\ \\ (3x+7)^2 -84x =(3x-7)^2 \\ \\ (3x + 7)^2 - (3x - 7)^2 = 84x \\ \\ = 4 \times 3x \times 7 = 84x \\ \\ = 84x = 84x \\ \\ \\ \therefore\ x\ can be any real or unreal number.$