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Simplifying
2r2 + -5 = 0
Reorder the terms:
-5 + 2r2 = 0
Solving
-5 + 2r2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '5' to each side of the equation.
-5 + 5 + 2r2 = 0 + 5
Combine like terms: -5 + 5 = 0
0 + 2r2 = 0 + 5
2r2 = 0 + 5
Combine like terms: 0 + 5 = 5
2r2 = 5
Divide each side by '2'.
r2 = 2.5
Simplifying
r2 = 2.5
Take the square root of each side:
r = {-1.58113883, 1.58113883}
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