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Simplifying
9 = -7 + 4x2
Solving
9 = -7 + 4x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-4x2' to each side of the equation.
9 + -4x2 = -7 + 4x2 + -4x2
Combine like terms: 4x2 + -4x2 = 0
9 + -4x2 = -7 + 0
9 + -4x2 = -7
Add '-9' to each side of the equation.
9 + -9 + -4x2 = -7 + -9
Combine like terms: 9 + -9 = 0
0 + -4x2 = -7 + -9
-4x2 = -7 + -9
Combine like terms: -7 + -9 = -16
-4x2 = -16
Divide each side by '-4'.
x2 = 4
Simplifying
x2 = 4
Take the square root of each side:
x = {-2, 2}
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