4k^2+20k=56

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Solution for 4k^2+20k=56 equation:


Simplifying
4k2 + 20k = 56

Reorder the terms:
20k + 4k2 = 56

Solving
20k + 4k2 = 56

Solving for variable 'k'.

Reorder the terms:
-56 + 20k + 4k2 = 56 + -56

Combine like terms: 56 + -56 = 0
-56 + 20k + 4k2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-14 + 5k + k2) = 0

Factor a trinomial.
4((-7 + -1k)(2 + -1k)) = 0

Ignore the factor 4.

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 '(2 + -1k)' equal to zero and attempt to solve: Simplifying 2 + -1k = 0 Solving 2 + -1k = 0 Move all terms containing k to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + -1k = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1k = 0 + -2 -1k = 0 + -2 Combine like terms: 0 + -2 = -2 -1k = -2 Divide each side by '-1'. k = 2 Simplifying k = 2

Solution

k = {-7, 2}

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