# Solve for z -2z^2+8=0

-2z2+8=0
Subtract 8 from both sides of the equation.
-2z2=-8
Divide each term by -2 and simplify.
Divide each term in -2z2=-8 by -2.
-2z2-2=-8-2
Cancel the common factor of -2.
Cancel the common factor.
-2z2-2=-8-2
Divide z2 by 1.
z2=-8-2
z2=-8-2
Divide -8 by -2.
z2=4
z2=4
Take the square root of both sides of the equation to eliminate the exponent on the left side.
z=±4
The complete solution is the result of both the positive and negative portions of the solution.
Simplify the right side of the equation.
Rewrite 4 as 22.
z=±22
Pull terms out from under the radical, assuming positive real numbers.
z=±2
z=±2
The complete solution is the result of both the positive and negative portions of the solution.
First, use the positive value of the ± to find the first solution.
z=2
Next, use the negative value of the ± to find the second solution.
z=-2
The complete solution is the result of both the positive and negative portions of the solution.
z=2,-2
z=2,-2
z=2,-2
Solve for z -2z^2+8=0

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