k^2+2k-7=8

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Solution for k^2+2k-7=8 equation:


Simplifying
k2 + 2k + -7 = 8

Reorder the terms:
-7 + 2k + k2 = 8

Solving
-7 + 2k + k2 = 8

Solving for variable 'k'.

Reorder the terms:
-7 + -8 + 2k + k2 = 8 + -8

Combine like terms: -7 + -8 = -15
-15 + 2k + k2 = 8 + -8

Combine like terms: 8 + -8 = 0
-15 + 2k + k2 = 0

Factor a trinomial.
(-5 + -1k)(3 + -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 '(3 + -1k)' equal to zero and attempt to solve: Simplifying 3 + -1k = 0 Solving 3 + -1k = 0 Move all terms containing k to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + -1k = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1k = 0 + -3 -1k = 0 + -3 Combine like terms: 0 + -3 = -3 -1k = -3 Divide each side by '-1'. k = 3 Simplifying k = 3

Solution

k = {-5, 3}

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