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Simplifying
3x2 + 12x2 + -15 = 0
Reorder the terms:
-15 + 3x2 + 12x2 = 0
Combine like terms: 3x2 + 12x2 = 15x2
-15 + 15x2 = 0
Solving
-15 + 15x2 = 0
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '15' to each side of the equation.
-15 + 15 + 15x2 = 0 + 15
Combine like terms: -15 + 15 = 0
0 + 15x2 = 0 + 15
15x2 = 0 + 15
Combine like terms: 0 + 15 = 15
15x2 = 15
Divide each side by '15'.
x2 = 1
Simplifying
x2 = 1
Take the square root of each side:
x = {-1, 1}
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