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Simplifying
2x2 + 7 + x2 + 18 = 90
Reorder the terms:
7 + 18 + 2x2 + x2 = 90
Combine like terms: 7 + 18 = 25
25 + 2x2 + x2 = 90
Combine like terms: 2x2 + x2 = 3x2
25 + 3x2 = 90
Solving
25 + 3x2 = 90
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-25' to each side of the equation.
25 + -25 + 3x2 = 90 + -25
Combine like terms: 25 + -25 = 0
0 + 3x2 = 90 + -25
3x2 = 90 + -25
Combine like terms: 90 + -25 = 65
3x2 = 65
Divide each side by '3'.
x2 = 21.66666667
Simplifying
x2 = 21.66666667
Take the square root of each side:
x = {-4.654746682, 4.654746682}
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