2r^2-7=91

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Solution for 2r^2-7=91 equation: 


Simplifying
2r2 + -7 = 91

Reorder the terms:
-7 + 2r2 = 91

Solving
-7 + 2r2 = 91

Solving for variable 'r'.

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

Add '7' to each side of the equation.
-7 + 7 + 2r2 = 91 + 7

Combine like terms: -7 + 7 = 0
0 + 2r2 = 91 + 7
2r2 = 91 + 7

Combine like terms: 91 + 7 = 98
2r2 = 98

Divide each side by '2'.
r2 = 49

Simplifying
r2 = 49

Take the square root of each side:
r = {-7, 7}

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