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Simplifying
7r2 + -10 = 8
Reorder the terms:
-10 + 7r2 = 8
Solving
-10 + 7r2 = 8
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '10' to each side of the equation.
-10 + 10 + 7r2 = 8 + 10
Combine like terms: -10 + 10 = 0
0 + 7r2 = 8 + 10
7r2 = 8 + 10
Combine like terms: 8 + 10 = 18
7r2 = 18
Divide each side by '7'.
r2 = 2.571428571
Simplifying
r2 = 2.571428571
Take the square root of each side:
r = {-1.603567451, 1.603567451}
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