Question

Cine mă poate ajuta??

Answer 1

(x-2)²=3*27

(x-2)²=81

x-2=+/-√81

x-2=+/-9

x-2=9

x=11

x-2=-9

x=-7

S={-7;11}

Altfel

sau , de la 

(x-2)²=81

(x-2)²-81=0

(x-2)²-9²=0

(x-2-9)(x-2+9)=0

(x-11)(x+7)=0

x-11=0....x=11

(x+7)=0....x=-7

S={-7;11}

Answer 2

$\frac{x - 2}{3} = \frac{27}{x - 2} \\ (x - 2) \times (x - 2) = 3 \times 27 \\ (x - 2) ^{2} = 81 \\ x - 2 = \sqrt{81} \\ x - 2 = 9 \\ x = 9 + 2 \\ x = 11$