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Simplifying
4r2 + -7 = 28
Reorder the terms:
-7 + 4r2 = 28
Solving
-7 + 4r2 = 28
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 + 4r2 = 28 + 7
Combine like terms: -7 + 7 = 0
0 + 4r2 = 28 + 7
4r2 = 28 + 7
Combine like terms: 28 + 7 = 35
4r2 = 35
Divide each side by '4'.
r2 = 8.75
Simplifying
r2 = 8.75
Take the square root of each side:
r = {-2.958039892, 2.958039892}
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