3x*x+4=16

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Solution for 3x*x+4=16 equation: 


Simplifying
3x * x + 4 = 16

Multiply x * x
3x2 + 4 = 16

Reorder the terms:
4 + 3x2 = 16

Solving
4 + 3x2 = 16

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 + 3x2 = 16 + -4

Combine like terms: 4 + -4 = 0
0 + 3x2 = 16 + -4
3x2 = 16 + -4

Combine like terms: 16 + -4 = 12
3x2 = 12

Divide each side by '3'.
x2 = 4

Simplifying
x2 = 4

Take the square root of each side:
x = {-2, 2}

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