2k^2=5k+18

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Solution for 2k^2=5k+18 equation:


Simplifying
2k2 = 5k + 18

Reorder the terms:
2k2 = 18 + 5k

Solving
2k2 = 18 + 5k

Solving for variable 'k'.

Reorder the terms:
-18 + -5k + 2k2 = 18 + 5k + -18 + -5k

Reorder the terms:
-18 + -5k + 2k2 = 18 + -18 + 5k + -5k

Combine like terms: 18 + -18 = 0
-18 + -5k + 2k2 = 0 + 5k + -5k
-18 + -5k + 2k2 = 5k + -5k

Combine like terms: 5k + -5k = 0
-18 + -5k + 2k2 = 0

Factor a trinomial.
(-2 + -1k)(9 + -2k) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(9 + -2k)' equal to zero and attempt to solve: Simplifying 9 + -2k = 0 Solving 9 + -2k = 0 Move all terms containing k to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + -2k = 0 + -9 Combine like terms: 9 + -9 = 0 0 + -2k = 0 + -9 -2k = 0 + -9 Combine like terms: 0 + -9 = -9 -2k = -9 Divide each side by '-2'. k = 4.5 Simplifying k = 4.5

Solution

k = {-2, 4.5}

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