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Simplifying
9x2 + 4 = 20
Reorder the terms:
4 + 9x2 = 20
Solving
4 + 9x2 = 20
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '-4' to each side of the equation.
4 + -4 + 9x2 = 20 + -4
Combine like terms: 4 + -4 = 0
0 + 9x2 = 20 + -4
9x2 = 20 + -4
Combine like terms: 20 + -4 = 16
9x2 = 16
Divide each side by '9'.
x2 = 1.777777778
Simplifying
x2 = 1.777777778
Take the square root of each side:
x = {-1.333333333, 1.333333333}
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