# How do you solve 5x^2 - 245 = 0 ?

Feb 25, 2016

$x = 7$ or $x = - 7$

#### Explanation:

$5 {x}^{2} - 245 = 0$
$5 {x}^{2} - 245 + 245 = 0 + 245$ to isolate the variable term (x)
$5 {x}^{2} = 245$
$\frac{5 {x}^{2}}{5} = \frac{245}{5}$ to isolate the ${x}^{2}$
${x}^{2} = 49$
$x = \sqrt{49}$ to eliminate the ${x}^{2}$
$x = 7$ or $x = - 7$ the square can be plus or minus