15-2z^2=-21

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Solution for 15-2z^2=-21 equation: 


Simplifying
15 + -2z2 = -21

Solving
15 + -2z2 = -21

Solving for variable 'z'.

Move all terms containing z to the left, all other terms to the right.

Add '-15' to each side of the equation.
15 + -15 + -2z2 = -21 + -15

Combine like terms: 15 + -15 = 0
0 + -2z2 = -21 + -15
-2z2 = -21 + -15

Combine like terms: -21 + -15 = -36
-2z2 = -36

Divide each side by '-2'.
z2 = 18

Simplifying
z2 = 18

Take the square root of each side:
z = {-4.242640687, 4.242640687}

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