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Simplifying
4x2 + -28 + 7 = 0
Reorder the terms:
-28 + 7 + 4x2 = 0
Combine like terms: -28 + 7 = -21
-21 + 4x2 = 0
Solving
-21 + 4x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '21' to each side of the equation.
-21 + 21 + 4x2 = 0 + 21
Combine like terms: -21 + 21 = 0
0 + 4x2 = 0 + 21
4x2 = 0 + 21
Combine like terms: 0 + 21 = 21
4x2 = 21
Divide each side by '4'.
x2 = 5.25
Simplifying
x2 = 5.25
Take the square root of each side:
x = {-2.291287847, 2.291287847}
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