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Simplifying
4x2 + 16 = 25
Reorder the terms:
16 + 4x2 = 25
Solving
16 + 4x2 = 25
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-16' to each side of the equation.
16 + -16 + 4x2 = 25 + -16
Combine like terms: 16 + -16 = 0
0 + 4x2 = 25 + -16
4x2 = 25 + -16
Combine like terms: 25 + -16 = 9
4x2 = 9
Divide each side by '4'.
x2 = 2.25
Simplifying
x2 = 2.25
Take the square root of each side:
x = {-1.5, 1.5}
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