Question

[x+3]mũ 2 =64  x=?

 

Answer 1

(x + 3)² = 64

Th1:

(x + 3)² = 8²

x + 3 = 8

x = 8 - 3

x = 5

Th2:

(x + 3)² = (- 8)²

x + 3 = - 8

x = - 8 - 3

x = - 11

Vậy x = 5 hoặc x = - 11

Answer 2

(x+3)²=64

Suy ra: x=8

 

Answer 3

Answer 4

\(\left(x+3\right)^2=64\)

\(\Leftrightarrow\left(x+3\right)^2=8^2\)

\(\Leftrightarrow x+3=8\)

\(\Leftrightarrow x=8-3\)

\(\Leftrightarrow x=5\)