(x-2)(x+9)=0

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Solution for (x-2)(x+9)=0 equation:


Simplifying
(x + -2)(x + 9) = 0

Reorder the terms:
(-2 + x)(x + 9) = 0

Reorder the terms:
(-2 + x)(9 + x) = 0

Multiply (-2 + x) * (9 + x)
(-2(9 + x) + x(9 + x)) = 0
((9 * -2 + x * -2) + x(9 + x)) = 0
((-18 + -2x) + x(9 + x)) = 0
(-18 + -2x + (9 * x + x * x)) = 0
(-18 + -2x + (9x + x2)) = 0

Combine like terms: -2x + 9x = 7x
(-18 + 7x + x2) = 0

Solving
-18 + 7x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-9 + -1x)(2 + -1x) = 0

Subproblem 1

Set the factor '(-9 + -1x)' equal to zero and attempt to solve: Simplifying -9 + -1x = 0 Solving -9 + -1x = 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 + -1x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = 0 + 9 -1x = 0 + 9 Combine like terms: 0 + 9 = 9 -1x = 9 Divide each side by '-1'. x = -9 Simplifying x = -9

Subproblem 2

Set the factor '(2 + -1x)' equal to zero and attempt to solve: Simplifying 2 + -1x = 0 Solving 2 + -1x = 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 + -1x = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1x = 0 + -2 -1x = 0 + -2 Combine like terms: 0 + -2 = -2 -1x = -2 Divide each side by '-1'. x = 2 Simplifying x = 2

Solution

x = {-9, 2}

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