Question

Помогите решить )

2a(a+5)-(a-7)^2

Answer 1

2a*(a+5)-(a-7)^2=(2a+10)*a-(a-7)^2=2a^2+10a-(a-7)^2=2a^2+10a-(a^2-14a+49)=2a^2+10a-a^2+14a-49=a^2+10a+14a-49=a^2+24a-49.

Answer 2

$2a(a+5)-(a-7)^2=2a^2+10a-(a^2-14a+49)= \ \ =2a^2+10a-a^2+14a-49=a^2+24a-49$