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Simplifying
4r2 + -9 = 9
Reorder the terms:
-9 + 4r2 = 9
Solving
-9 + 4r2 = 9
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '9' to each side of the equation.
-9 + 9 + 4r2 = 9 + 9
Combine like terms: -9 + 9 = 0
0 + 4r2 = 9 + 9
4r2 = 9 + 9
Combine like terms: 9 + 9 = 18
4r2 = 18
Divide each side by '4'.
r2 = 4.5
Simplifying
r2 = 4.5
Take the square root of each side:
r = {-2.121320344, 2.121320344}
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