2r^2+4=12

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Solution for 2r^2+4=12 equation: 


Simplifying
2r2 + 4 = 12

Reorder the terms:
4 + 2r2 = 12

Solving
4 + 2r2 = 12

Solving for variable 'r'.

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

Add '-4' to each side of the equation.
4 + -4 + 2r2 = 12 + -4

Combine like terms: 4 + -4 = 0
0 + 2r2 = 12 + -4
2r2 = 12 + -4

Combine like terms: 12 + -4 = 8
2r2 = 8

Divide each side by '2'.
r2 = 4

Simplifying
r2 = 4

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

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