Solve x^2-4*2 - ScanMath

Evaluate

x^{2} - 4 \times 2

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

x^{2} - 4 \times 2 = 0

Multiply the numbers

x^{2} - 8 = 0

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

x^{2} = 0 + 8

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

x^{2} = 8

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

x = \pm 8

Simplify the expression

More Steps

x = \pm 22

Separate the equation into 2 possible cases

x = 22 x = - 22

Solution

x_{1} = - 22, x_{2} = 22

Alternative Form

x_{1} \approx - 2.828427, x_{2} \approx 2.828427

Simplify the expression