k^2=13k-40

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Solution for k^2=13k-40 equation:


Simplifying
k2 = 13k + -40

Reorder the terms:
k2 = -40 + 13k

Solving
k2 = -40 + 13k

Solving for variable 'k'.

Reorder the terms:
40 + -13k + k2 = -40 + 13k + 40 + -13k

Reorder the terms:
40 + -13k + k2 = -40 + 40 + 13k + -13k

Combine like terms: -40 + 40 = 0
40 + -13k + k2 = 0 + 13k + -13k
40 + -13k + k2 = 13k + -13k

Combine like terms: 13k + -13k = 0
40 + -13k + k2 = 0

Factor a trinomial.
(5 + -1k)(8 + -1k) = 0

Subproblem 1

Set the factor '(5 + -1k)' equal to zero and attempt to solve: Simplifying 5 + -1k = 0 Solving 5 + -1k = 0 Move all terms containing k to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1k = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1k = 0 + -5 -1k = 0 + -5 Combine like terms: 0 + -5 = -5 -1k = -5 Divide each side by '-1'. k = 5 Simplifying k = 5

Subproblem 2

Set the factor '(8 + -1k)' equal to zero and attempt to solve: Simplifying 8 + -1k = 0 Solving 8 + -1k = 0 Move all terms containing k to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1k = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1k = 0 + -8 -1k = 0 + -8 Combine like terms: 0 + -8 = -8 -1k = -8 Divide each side by '-1'. k = 8 Simplifying k = 8

Solution

k = {5, 8}

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