9-7r^2=-432

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Solution for 9-7r^2=-432 equation: 


Simplifying
9 + -7r2 = -432

Solving
9 + -7r2 = -432

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 + -7r2 = -432 + -9

Combine like terms: 9 + -9 = 0
0 + -7r2 = -432 + -9
-7r2 = -432 + -9

Combine like terms: -432 + -9 = -441
-7r2 = -441

Divide each side by '-7'.
r2 = 63

Simplifying
r2 = 63

Take the square root of each side:
r = {-7.937253933, 7.937253933}

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