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Simplifying
9x2 + 3 = 21
Reorder the terms:
3 + 9x2 = 21
Solving
3 + 9x2 = 21
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-3' to each side of the equation.
3 + -3 + 9x2 = 21 + -3
Combine like terms: 3 + -3 = 0
0 + 9x2 = 21 + -3
9x2 = 21 + -3
Combine like terms: 21 + -3 = 18
9x2 = 18
Divide each side by '9'.
x2 = 2
Simplifying
x2 = 2
Take the square root of each side:
x = {-1.414213562, 1.414213562}
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