Question

Tìm x biết: (x + 2)² = 36

Answer 1

(x+2)^2=36.

=>(x+2)^2=(-6)^2 hoặc =6^2.

Nếu (x+2)^2=(-6)^2.

=>x+2=-6.

=>x=-6-2.

=>x=-8.

Nếu (x+2)^2=6^2.

=>x+2=6.

=>x=6-2.

=>x=4.

Vậy........

Answer 2

(x + 2)² = 36

(x + 2)² = 6^2 hoặc (x+2)^2 = (-6)^2

=> x+2 = 6 hoặc x+2 = -6

x= 4 hoặc x= -8

Answer 3

(x+2)²=36

(x+2)²=6²

=> x+2=6

x=6-2

x=4

Vậy x = 4

Answer 4

\(\left(x+2\right)^2=36\)

\(\Leftrightarrow\left(x+2\right)^2=\sqrt{36}\)

\(\Rightarrow x+2=-6\)

 hoặc\(x+2=6\)

Neu x + 2 = -6 

<=> x = -6 - 2 

<=> x = -8

Neu x + 2 = 6

<=> x = 6 - 2

<=> x = 4

Vay \(\left(x+2\right)^2=36\)

khi va chi khi x = -8 ; x= 4

Answer 5

(x+2)²=36

(x+2)²=(6)²

th1: x+2=6    th2: x+2=-6  

      x=6-2            x=-6-2

       x=4              x=-8