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