Question

find the square of 3a + 7b

Answer 1

Bonjour!

$= > {(3a + 7b)}^{2} \\ \\ = > {(3a)}^{2} + {(7b)}^{2} + 2(3a)(7b) \\ \\ = > 9 {a}^{2} + 49 {b}^{2} + 42ab$

Hope this helps...:)

Answer 2

${9a}^{2} + {49b}^{2} + 42ab$
by formula
(a+B)2=a2+b2+2ab