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Simplifying
(7r)(5r + 2r) = 0
Remove parenthesis around (7r)
7r(5r + 2r) = 0
Combine like terms: 5r + 2r = 7r
7r(7r) = 0
Remove parenthesis around (7r)
7r * 7r = 0
Reorder the terms for easier multiplication:
7 * 7r * r = 0
Multiply 7 * 7
49r * r = 0
Multiply r * r
49r2 = 0
Solving
49r2 = 0
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Divide each side by '49'.
r2 = 0
Simplifying
r2 = 0
Take the square root of each side:
r = {0}
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