Question

Упростите выражение:
a(a+5b)-(a+b)(a-b)

Answer 1

$a(a+5b)-(a+b)(a-b)=a ^2+5ab-(a^2-ab+ab-b^2)$$=a^2+5ab-a^2+b^2=$$5ab+b^2=$$b(5a+b)$