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Simplifying
3x2 + 1 = 21
Reorder the terms:
1 + 3x2 = 21
Solving
1 + 3x2 = 21
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-1' to each side of the equation.
1 + -1 + 3x2 = 21 + -1
Combine like terms: 1 + -1 = 0
0 + 3x2 = 21 + -1
3x2 = 21 + -1
Combine like terms: 21 + -1 = 20
3x2 = 20
Divide each side by '3'.
x2 = 6.666666667
Simplifying
x2 = 6.666666667
Take the square root of each side:
x = {-2.581988898, 2.581988898}
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