5x^2=21x+54

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Solution for 5x^2=21x+54 equation:


Simplifying
5x2 = 21x + 54

Reorder the terms:
5x2 = 54 + 21x

Solving
5x2 = 54 + 21x

Solving for variable 'x'.

Reorder the terms:
-54 + -21x + 5x2 = 54 + 21x + -54 + -21x

Reorder the terms:
-54 + -21x + 5x2 = 54 + -54 + 21x + -21x

Combine like terms: 54 + -54 = 0
-54 + -21x + 5x2 = 0 + 21x + -21x
-54 + -21x + 5x2 = 21x + -21x

Combine like terms: 21x + -21x = 0
-54 + -21x + 5x2 = 0

Factor a trinomial.
(-9 + -5x)(6 + -1x) = 0

Subproblem 1

Set the factor '(-9 + -5x)' equal to zero and attempt to solve: Simplifying -9 + -5x = 0 Solving -9 + -5x = 0 Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -5x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -5x = 0 + 9 -5x = 0 + 9 Combine like terms: 0 + 9 = 9 -5x = 9 Divide each side by '-5'. x = -1.8 Simplifying x = -1.8

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 = {-1.8, 6}

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