Question

alguem pode me ajudar
 (3x-9)²=36

Answer 1

9x+81=36
9x=36-81
9x=-45
x=-5

Answer 2

$(3x-9) ^{2} = 36$

9x²-54x +81=36

9x²-54x+45=0  (: por 9)

x²-6x +5=0

Δ=36-20=16
√Δ=4

$x'= \frac{6+4}{2} = \frac{10}{2} = 5$

$x"= \frac{6-4}{2} = \frac{2}{2} = 1$

S={1;5}