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Simplifying
(x + -15)(x + 15) = 0
Reorder the terms:
(-15 + x)(x + 15) = 0
Reorder the terms:
(-15 + x)(15 + x) = 0
Multiply (-15 + x) * (15 + x)
(-15(15 + x) + x(15 + x)) = 0
((15 * -15 + x * -15) + x(15 + x)) = 0
((-225 + -15x) + x(15 + x)) = 0
(-225 + -15x + (15 * x + x * x)) = 0
(-225 + -15x + (15x + x2)) = 0
Combine like terms: -15x + 15x = 0
(-225 + 0 + x2) = 0
(-225 + x2) = 0
Solving
-225 + x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '225' to each side of the equation.
-225 + 225 + x2 = 0 + 225
Combine like terms: -225 + 225 = 0
0 + x2 = 0 + 225
x2 = 0 + 225
Combine like terms: 0 + 225 = 225
x2 = 225
Simplifying
x2 = 225
Take the square root of each side:
x = {-15, 15}
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