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Simplifying
2r2 + -4 = 8
Reorder the terms:
-4 + 2r2 = 8
Solving
-4 + 2r2 = 8
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 = 8 + 4
Combine like terms: -4 + 4 = 0
0 + 2r2 = 8 + 4
2r2 = 8 + 4
Combine like terms: 8 + 4 = 12
2r2 = 12
Divide each side by '2'.
r2 = 6
Simplifying
r2 = 6
Take the square root of each side:
r = {-2.449489743, 2.449489743}
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