8-4r^2=-30

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Solution for 8-4r^2=-30 equation: 


Simplifying
8 + -4r2 = -30

Solving
8 + -4r2 = -30

Solving for variable 'r'.

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

Add '-8' to each side of the equation.
8 + -8 + -4r2 = -30 + -8

Combine like terms: 8 + -8 = 0
0 + -4r2 = -30 + -8
-4r2 = -30 + -8

Combine like terms: -30 + -8 = -38
-4r2 = -38

Divide each side by '-4'.
r2 = 9.5

Simplifying
r2 = 9.5

Take the square root of each side:
r = {-3.082207001, 3.082207001}

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