Question

5-A- (a+7)2 × (a+7)

B- (3x+1) × (3x+-1)

C- (m+3) × (m-3)

D- (2a-5)2

Answer 1

a+7+2a+14 a=-7
3a+21
a=-21/3

b)9x^2-3x+3x-1
9x^2=1
×^2=1/9

c)m^2-3m+3m-9
m^2=9
m=
$\sqrt{9}$