Question

evaluate

(3x+7)(3x+7)​

Answer 1

(a+b) (a+b)

a²+b²

(3x)²+7²

9x²+49

Hope ita helps you

Answer 2

$(a+b)(a+b) = (a)²+(b)²$

$(3x+7)(3x+7) = (3x)² + (7)² \\\\\ \implies 9x² + 49$