3k^2=84+9k

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Solution for 3k^2=84+9k equation:


Simplifying
3k2 = 84 + 9k

Solving
3k2 = 84 + 9k

Solving for variable 'k'.

Reorder the terms:
-84 + -9k + 3k2 = 84 + 9k + -84 + -9k

Reorder the terms:
-84 + -9k + 3k2 = 84 + -84 + 9k + -9k

Combine like terms: 84 + -84 = 0
-84 + -9k + 3k2 = 0 + 9k + -9k
-84 + -9k + 3k2 = 9k + -9k

Combine like terms: 9k + -9k = 0
-84 + -9k + 3k2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-28 + -3k + k2) = 0

Factor a trinomial.
3((-4 + -1k)(7 + -1k)) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-4 + -1k)' equal to zero and attempt to solve: Simplifying -4 + -1k = 0 Solving -4 + -1k = 0 Move all terms containing k to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -1k = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -1k = 0 + 4 -1k = 0 + 4 Combine like terms: 0 + 4 = 4 -1k = 4 Divide each side by '-1'. k = -4 Simplifying k = -4

Subproblem 2

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

Solution

k = {-4, 7}

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