# What is x in the equation 5x^2 = 49?

Divide both sides by $5$: ${x}^{2} = \frac{49}{5} = 9.8$
Divide both sides by $5$: $x = \sqrt{9.8} \cong 3.13$
Note that technically this should be $\pm 3.13$, since squaring either will yield $9.8$.