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Simplifying
28 = 4x2
Solving
28 = 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.
28 + -4x2 = 4x2 + -4x2
Combine like terms: 4x2 + -4x2 = 0
28 + -4x2 = 0
Add '-28' to each side of the equation.
28 + -28 + -4x2 = 0 + -28
Combine like terms: 28 + -28 = 0
0 + -4x2 = 0 + -28
-4x2 = 0 + -28
Combine like terms: 0 + -28 = -28
-4x2 = -28
Divide each side by '-4'.
x2 = 7
Simplifying
x2 = 7
Take the square root of each side:
x = {-2.645751311, 2.645751311}
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