X^2 - 4

Find the roots

Write the polynomial as an equation.

y=x^2-4

To find the roots of the equation, replace y with 0 and solve.

0=x^2-4

Replace y with 0 and solve for x

X^2-4=0

Add 4 to both sides of the equation

X^2=4

Take the square root of both sides of the equation to eliminate the exponent on the left side.

X = ±√4

The complete solution is the result of both the positive and negative portions of the solution.

X=2,-2