20(x^2-1)=9x

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Solution for 20(x^2-1)=9x equation:


Simplifying
20(x2 + -1) = 9x

Reorder the terms:
20(-1 + x2) = 9x
(-1 * 20 + x2 * 20) = 9x
(-20 + 20x2) = 9x

Solving
-20 + 20x2 = 9x

Solving for variable 'x'.

Reorder the terms:
-20 + -9x + 20x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-20 + -9x + 20x2 = 0

Factor a trinomial.
(-4 + -5x)(5 + -4x) = 0

Subproblem 1

Set the factor '(-4 + -5x)' equal to zero and attempt to solve: Simplifying -4 + -5x = 0 Solving -4 + -5x = 0 Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + -5x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -5x = 0 + 4 -5x = 0 + 4 Combine like terms: 0 + 4 = 4 -5x = 4 Divide each side by '-5'. x = -0.8 Simplifying x = -0.8

Subproblem 2

Set the factor '(5 + -4x)' equal to zero and attempt to solve: Simplifying 5 + -4x = 0 Solving 5 + -4x = 0 Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -4x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -4x = 0 + -5 -4x = 0 + -5 Combine like terms: 0 + -5 = -5 -4x = -5 Divide each side by '-4'. x = 1.25 Simplifying x = 1.25

Solution

x = {-0.8, 1.25}

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