Question

Which is a value of x, when 3x^2+4=40

A. 2√3
B. 2√6
C. 2√11
D. 3√2

Answer 1

\[
\begin{align}
3x^2+4&=40\\
3x^2&=36\\
x^2&=12\\
x&=\pm\sqrt{12}\\
x&=\pm2\sqrt{3}
\end{align}
\]

Answer 2

Thanks!