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Simplifying
4X2 + -9 = 40
Reorder the terms:
-9 + 4X2 = 40
Solving
-9 + 4X2 = 40
Solving for variable 'X'.
Move all terms containing X to the left, all other terms to the right.
Add '9' to each side of the equation.
-9 + 9 + 4X2 = 40 + 9
Combine like terms: -9 + 9 = 0
0 + 4X2 = 40 + 9
4X2 = 40 + 9
Combine like terms: 40 + 9 = 49
4X2 = 49
Divide each side by '4'.
X2 = 12.25
Simplifying
X2 = 12.25
Take the square root of each side:
X = {-3.5, 3.5}
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