18x^2+21x-400=0

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Solution for 18x^2+21x-400=0 equation:


Simplifying
18x2 + 21x + -400 = 0

Reorder the terms:
-400 + 21x + 18x2 = 0

Solving
-400 + 21x + 18x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-16 + -3x)(25 + -6x) = 0

Subproblem 1

Set the factor '(-16 + -3x)' equal to zero and attempt to solve: Simplifying -16 + -3x = 0 Solving -16 + -3x = 0 Move all terms containing x to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + -3x = 0 + 16 Combine like terms: -16 + 16 = 0 0 + -3x = 0 + 16 -3x = 0 + 16 Combine like terms: 0 + 16 = 16 -3x = 16 Divide each side by '-3'. x = -5.333333333 Simplifying x = -5.333333333

Subproblem 2

Set the factor '(25 + -6x)' equal to zero and attempt to solve: Simplifying 25 + -6x = 0 Solving 25 + -6x = 0 Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + -6x = 0 + -25 Combine like terms: 25 + -25 = 0 0 + -6x = 0 + -25 -6x = 0 + -25 Combine like terms: 0 + -25 = -25 -6x = -25 Divide each side by '-6'. x = 4.166666667 Simplifying x = 4.166666667

Solution

x = {-5.333333333, 4.166666667}

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