10(x^2-1)=21x

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Solution for 10(x^2-1)=21x equation:


Simplifying
10(x2 + -1) = 21x

Reorder the terms:
10(-1 + x2) = 21x
(-1 * 10 + x2 * 10) = 21x
(-10 + 10x2) = 21x

Solving
-10 + 10x2 = 21x

Solving for variable 'x'.

Reorder the terms:
-10 + -21x + 10x2 = 21x + -21x

Combine like terms: 21x + -21x = 0
-10 + -21x + 10x2 = 0

Factor a trinomial.
(-2 + -5x)(5 + -2x) = 0

Subproblem 1

Set the factor '(-2 + -5x)' equal to zero and attempt to solve: Simplifying -2 + -5x = 0 Solving -2 + -5x = 0 Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + -5x = 0 + 2 Combine like terms: -2 + 2 = 0 0 + -5x = 0 + 2 -5x = 0 + 2 Combine like terms: 0 + 2 = 2 -5x = 2 Divide each side by '-5'. x = -0.4 Simplifying x = -0.4

Subproblem 2

Set the factor '(5 + -2x)' equal to zero and attempt to solve: Simplifying 5 + -2x = 0 Solving 5 + -2x = 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 + -2x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -2x = 0 + -5 -2x = 0 + -5 Combine like terms: 0 + -5 = -5 -2x = -5 Divide each side by '-2'. x = 2.5 Simplifying x = 2.5

Solution

x = {-0.4, 2.5}

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