21r^2+46r-80=0

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Solution for 21r^2+46r-80=0 equation:


Simplifying
21r2 + 46r + -80 = 0

Reorder the terms:
-80 + 46r + 21r2 = 0

Solving
-80 + 46r + 21r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(-10 + -3r)(8 + -7r) = 0

Subproblem 1

Set the factor '(-10 + -3r)' equal to zero and attempt to solve: Simplifying -10 + -3r = 0 Solving -10 + -3r = 0 Move all terms containing r to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + -3r = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -3r = 0 + 10 -3r = 0 + 10 Combine like terms: 0 + 10 = 10 -3r = 10 Divide each side by '-3'. r = -3.333333333 Simplifying r = -3.333333333

Subproblem 2

Set the factor '(8 + -7r)' equal to zero and attempt to solve: Simplifying 8 + -7r = 0 Solving 8 + -7r = 0 Move all terms containing r to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -7r = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -7r = 0 + -8 -7r = 0 + -8 Combine like terms: 0 + -8 = -8 -7r = -8 Divide each side by '-7'. r = 1.142857143 Simplifying r = 1.142857143

Solution

r = {-3.333333333, 1.142857143}

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