1. (a+9)²+2a(a+9)= 2. ay-2ab+2by-y²=

Question

1. (a+9)²+2a(a+9)=

2. ay-2ab+2by-y²=

Answer 1

1.а^2+18a+81+2a^2+18a=

3a^2+36a+81=0

D=1296-972=324

корни:

a=-36+18/6=-3

a=-36-18/6=-9

2.ay-2ab+by-y^2

разложим по множителям

-2b(a-y)+y(a-y)=

(-2b+y)(a-y)