X^2=3X+18

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Solution for X^2=3X+18 equation:


Simplifying
X2 = 3X + 18

Reorder the terms:
X2 = 18 + 3X

Solving
X2 = 18 + 3X

Solving for variable 'X'.

Reorder the terms:
-18 + -3X + X2 = 18 + 3X + -18 + -3X

Reorder the terms:
-18 + -3X + X2 = 18 + -18 + 3X + -3X

Combine like terms: 18 + -18 = 0
-18 + -3X + X2 = 0 + 3X + -3X
-18 + -3X + X2 = 3X + -3X

Combine like terms: 3X + -3X = 0
-18 + -3X + X2 = 0

Factor a trinomial.
(-3 + -1X)(6 + -1X) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(6 + -1X)' equal to zero and attempt to solve: Simplifying 6 + -1X = 0 Solving 6 + -1X = 0 Move all terms containing X to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + -1X = 0 + -6 Combine like terms: 6 + -6 = 0 0 + -1X = 0 + -6 -1X = 0 + -6 Combine like terms: 0 + -6 = -6 -1X = -6 Divide each side by '-1'. X = 6 Simplifying X = 6

Solution

X = {-3, 6}

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