10r^2+17r-20=0

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Solution for 10r^2+17r-20=0 equation:


Simplifying
10r2 + 17r + -20 = 0

Reorder the terms:
-20 + 17r + 10r2 = 0

Solving
-20 + 17r + 10r2 = 0

Solving for variable 'r'.

Factor a trinomial.
(-5 + -2r)(4 + -5r) = 0

Subproblem 1

Set the factor '(-5 + -2r)' equal to zero and attempt to solve: Simplifying -5 + -2r = 0 Solving -5 + -2r = 0 Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + -2r = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2r = 0 + 5 -2r = 0 + 5 Combine like terms: 0 + 5 = 5 -2r = 5 Divide each side by '-2'. r = -2.5 Simplifying r = -2.5

Subproblem 2

Set the factor '(4 + -5r)' equal to zero and attempt to solve: Simplifying 4 + -5r = 0 Solving 4 + -5r = 0 Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -5r = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -5r = 0 + -4 -5r = 0 + -4 Combine like terms: 0 + -4 = -4 -5r = -4 Divide each side by '-5'. r = 0.8 Simplifying r = 0.8

Solution

r = {-2.5, 0.8}

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