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Simplifying
-7x2 + 28 = 0
Reorder the terms:
28 + -7x2 = 0
Solving
28 + -7x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-28' to each side of the equation.
28 + -28 + -7x2 = 0 + -28
Combine like terms: 28 + -28 = 0
0 + -7x2 = 0 + -28
-7x2 = 0 + -28
Combine like terms: 0 + -28 = -28
-7x2 = -28
Divide each side by '-7'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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