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Simplifying
105 = 5x2 + 15
Reorder the terms:
105 = 15 + 5x2
Solving
105 = 15 + 5x2
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-5x2' to each side of the equation.
105 + -5x2 = 15 + 5x2 + -5x2
Combine like terms: 5x2 + -5x2 = 0
105 + -5x2 = 15 + 0
105 + -5x2 = 15
Add '-105' to each side of the equation.
105 + -105 + -5x2 = 15 + -105
Combine like terms: 105 + -105 = 0
0 + -5x2 = 15 + -105
-5x2 = 15 + -105
Combine like terms: 15 + -105 = -90
-5x2 = -90
Divide each side by '-5'.
x2 = 18
Simplifying
x2 = 18
Take the square root of each side:
x = {-4.242640687, 4.242640687}
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