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Simplifying
-5x2 + 21 = -104
Reorder the terms:
21 + -5x2 = -104
Solving
21 + -5x2 = -104
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-21' to each side of the equation.
21 + -21 + -5x2 = -104 + -21
Combine like terms: 21 + -21 = 0
0 + -5x2 = -104 + -21
-5x2 = -104 + -21
Combine like terms: -104 + -21 = -125
-5x2 = -125
Divide each side by '-5'.
x2 = 25
Simplifying
x2 = 25
Take the square root of each side:
x = {-5, 5}
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