Question

como resolver (x+3)(x+3)+(x-3)(x-3)

Answer 1

Vamos lá:

(x+3).(x+3)+(x-3).(x-3)=0

(x²+3x+3x+9)+( x²-3x-3x+9)=0

x²+9x+9+x²-9x+9 =0

2x²+18=0

2x²= -18

x²= -18/2= -9

x=√-9.