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Simplifying
2z2 + -115 = 173
Reorder the terms:
-115 + 2z2 = 173
Solving
-115 + 2z2 = 173
Solving for variable 'z'.
Move all terms containing z to the left, all other terms to the right.
Add '115' to each side of the equation.
-115 + 115 + 2z2 = 173 + 115
Combine like terms: -115 + 115 = 0
0 + 2z2 = 173 + 115
2z2 = 173 + 115
Combine like terms: 173 + 115 = 288
2z2 = 288
Divide each side by '2'.
z2 = 144
Simplifying
z2 = 144
Take the square root of each side:
z = {-12, 12}
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