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Simplifying
4(x2 + -10) = 9
Reorder the terms:
4(-10 + x2) = 9
(-10 * 4 + x2 * 4) = 9
(-40 + 4x2) = 9
Solving
-40 + 4x2 = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '40' to each side of the equation.
-40 + 40 + 4x2 = 9 + 40
Combine like terms: -40 + 40 = 0
0 + 4x2 = 9 + 40
4x2 = 9 + 40
Combine like terms: 9 + 40 = 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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