Solve 5x^2-80 - ScanMath

Evaluate

5 x^{2} - 80

To find the roots of the expression,set the expression equal to 0

5 x^{2} - 80 = 0

Move the constant to the right-hand side and change its sign

5 x^{2} = 0 + 80

Removing 0 doesn't change the value,so remove it from the expression

5 x^{2} = 80

Divide both sides

\frac{5 x ^{2}}{5} = \frac{80}{5}

Divide the numbers

x^{2} = \frac{80}{5}

Divide the numbers

More Steps

x^{2} = 16

Take the root of both sides of the equation and remember to use both positive and negative roots

x = \pm 16

Simplify the expression

More Steps

x = \pm 4

Separate the equation into 2 possible cases

x = 4 x = - 4

Solution

x_{1} = - 4, x_{2} = 4

Factor the expression