Question

 

 

Answer 1

\(8x^2-5=67\)

=>\(8x^2=5+67=72\)

=>\(x^2=\dfrac{72}{8}=9\)

=>\(\left[{}\begin{matrix}x=3\\x=-3\end{matrix}\right.\)

Answer 2

`8x^2 - 5 = 67`

`=>8x^2 = 72`

`=>x^2 = 9`

`=>`\(x=\pm3\)

Answer 3

=>

=>