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Simplifying
25r2 + -7 = 74
Reorder the terms:
-7 + 25r2 = 74
Solving
-7 + 25r2 = 74
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 + 25r2 = 74 + 7
Combine like terms: -7 + 7 = 0
0 + 25r2 = 74 + 7
25r2 = 74 + 7
Combine like terms: 74 + 7 = 81
25r2 = 81
Divide each side by '25'.
r2 = 3.24
Simplifying
r2 = 3.24
Take the square root of each side:
r = {-1.8, 1.8}
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