Question

a) (x + 3) elevado a 3

b) (7 - x) (7 + x)

Answer 1

(x+3)³=x³+3x²*3+3x*3²+3²

=3x*9+27+x³+9x²

=x³+9x²+27x+27

Forma fatorada:

x+3 = 0

x = —3

B)

(7—x)(7+x)

49+7x—7x—x²

—x²+49=0

—x²=—49

x²=+49

x = ±√49

x = ±7

Dúvidas??Comente!!