Question

45 + ( 2x + 4 )^2 = 81 giải giùm zới THANK >.< NHÌU

 

Answer 1

(2x + 4) ² = 81-45 = 36

<=> 4x + 16 =36

<=> 4x = 20

=> x= 5

Answer 2

\(45+\left(2x+4\right)^2=81\)

\(\left(2x+4\right)^2=36\)

\(\left(2x+4\right)^2=6^2\)

\(\Rightarrow2x+4=6\)

\(\Rightarrow2x=2\)

\(\Rightarrow x=1\)

vậy \(x=1\)