3x^2-16=20

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Solution for 3x^2-16=20 equation:


Simplifying
3x2 + -16 = 20

Reorder the terms:
-16 + 3x2 = 20

Solving
-16 + 3x2 = 20

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '16' to each side of the equation.
-16 + 16 + 3x2 = 20 + 16

Combine like terms: -16 + 16 = 0
0 + 3x2 = 20 + 16
3x2 = 20 + 16

Combine like terms: 20 + 16 = 36
3x2 = 36

Divide each side by '3'.
x2 = 12

Simplifying
x2 = 12

Take the square root of each side:
x = {-3.464101615, 3.464101615}

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