Question

simplify using (a+b)²= a² + 2ab + b²

(a+7)² + (a-7)²​

Answer 1

Step-by-step explanation:

(a+7)^2=a^2+49+2*a*7

=a^2+49+14a

(a-7)^2=a^2+49-2*a*7

=a^2+49-14a

replace (a+7) and (a-7)

(a^2+49+14a)+(a^2+49-14a)

a^2+a^2+49+49+14a-14a

2a^2+98