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Simplifying
64r2 + 4 = 40
Reorder the terms:
4 + 64r2 = 40
Solving
4 + 64r2 = 40
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 + 64r2 = 40 + -4
Combine like terms: 4 + -4 = 0
0 + 64r2 = 40 + -4
64r2 = 40 + -4
Combine like terms: 40 + -4 = 36
64r2 = 36
Divide each side by '64'.
r2 = 0.5625
Simplifying
r2 = 0.5625
Take the square root of each side:
r = {-0.75, 0.75}
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