15r^2-70r-245=0

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Solution for 15r^2-70r-245=0 equation:


Simplifying
15r2 + -70r + -245 = 0

Reorder the terms:
-245 + -70r + 15r2 = 0

Solving
-245 + -70r + 15r2 = 0

Solving for variable 'r'.

Factor out the Greatest Common Factor (GCF), '5'.
5(-49 + -14r + 3r2) = 0

Factor a trinomial.
5((-7 + -3r)(7 + -1r)) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(-7 + -3r)' equal to zero and attempt to solve: Simplifying -7 + -3r = 0 Solving -7 + -3r = 0 Move all terms containing r to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + -3r = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -3r = 0 + 7 -3r = 0 + 7 Combine like terms: 0 + 7 = 7 -3r = 7 Divide each side by '-3'. r = -2.333333333 Simplifying r = -2.333333333

Subproblem 2

Set the factor '(7 + -1r)' equal to zero and attempt to solve: Simplifying 7 + -1r = 0 Solving 7 + -1r = 0 Move all terms containing r to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + -1r = 0 + -7 Combine like terms: 7 + -7 = 0 0 + -1r = 0 + -7 -1r = 0 + -7 Combine like terms: 0 + -7 = -7 -1r = -7 Divide each side by '-1'. r = 7 Simplifying r = 7

Solution

r = {-2.333333333, 7}

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