k^2-4k-68=9

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Solution for k^2-4k-68=9 equation:


Simplifying
k2 + -4k + -68 = 9

Reorder the terms:
-68 + -4k + k2 = 9

Solving
-68 + -4k + k2 = 9

Solving for variable 'k'.

Reorder the terms:
-68 + -9 + -4k + k2 = 9 + -9

Combine like terms: -68 + -9 = -77
-77 + -4k + k2 = 9 + -9

Combine like terms: 9 + -9 = 0
-77 + -4k + k2 = 0

Factor a trinomial.
(-7 + -1k)(11 + -1k) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(11 + -1k)' equal to zero and attempt to solve: Simplifying 11 + -1k = 0 Solving 11 + -1k = 0 Move all terms containing k to the left, all other terms to the right. Add '-11' to each side of the equation. 11 + -11 + -1k = 0 + -11 Combine like terms: 11 + -11 = 0 0 + -1k = 0 + -11 -1k = 0 + -11 Combine like terms: 0 + -11 = -11 -1k = -11 Divide each side by '-1'. k = 11 Simplifying k = 11

Solution

k = {-7, 11}

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