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Simplifying
7z2 + -28 = 0
Reorder the terms:
-28 + 7z2 = 0
Solving
-28 + 7z2 = 0
Solving for variable 'z'.
Move all terms containing z to the left, all other terms to the right.
Add '28' to each side of the equation.
-28 + 28 + 7z2 = 0 + 28
Combine like terms: -28 + 28 = 0
0 + 7z2 = 0 + 28
7z2 = 0 + 28
Combine like terms: 0 + 28 = 28
7z2 = 28
Divide each side by '7'.
z2 = 4
Simplifying
z2 = 4
Take the square root of each side:
z = {-2, 2}
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