5r^2-32r=21

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Solution for 5r^2-32r=21 equation:


Simplifying
5r2 + -32r = 21

Reorder the terms:
-32r + 5r2 = 21

Solving
-32r + 5r2 = 21

Solving for variable 'r'.

Reorder the terms:
-21 + -32r + 5r2 = 21 + -21

Combine like terms: 21 + -21 = 0
-21 + -32r + 5r2 = 0

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

Subproblem 1

Set the factor '(-3 + -5r)' equal to zero and attempt to solve: Simplifying -3 + -5r = 0 Solving -3 + -5r = 0 Move all terms containing r to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + -5r = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -5r = 0 + 3 -5r = 0 + 3 Combine like terms: 0 + 3 = 3 -5r = 3 Divide each side by '-5'. r = -0.6 Simplifying r = -0.6

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 = {-0.6, 7}

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