3x*x-20=28

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Solution for 3x*x-20=28 equation: 


Simplifying
3x * x + -20 = 28

Multiply x * x
3x2 + -20 = 28

Reorder the terms:
-20 + 3x2 = 28

Solving
-20 + 3x2 = 28

Solving for variable 'x'.

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

Add '20' to each side of the equation.
-20 + 20 + 3x2 = 28 + 20

Combine like terms: -20 + 20 = 0
0 + 3x2 = 28 + 20
3x2 = 28 + 20

Combine like terms: 28 + 20 = 48
3x2 = 48

Divide each side by '3'.
x2 = 16

Simplifying
x2 = 16

Take the square root of each side:
x = {-4, 4}

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