Question

como se resuelve esto? 5x²+15=60

Answer 1

$\begin{gathered} 5x^2+15\text{ = 60} \\ 5x^2=60-15 \\ 5x^2=45 \\ x^2=\frac{45}{5} \\ x^2=9 \\ x=\sqrt[]{9\text{ }}=\pm3 \end{gathered}$

x = 3 or -3