40=-5(x+3)(x-6)

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Solution for 40=-5(x+3)(x-6) equation:


Simplifying
40 = -5(x + 3)(x + -6)

Reorder the terms:
40 = -5(3 + x)(x + -6)

Reorder the terms:
40 = -5(3 + x)(-6 + x)

Multiply (3 + x) * (-6 + x)
40 = -5(3(-6 + x) + x(-6 + x))
40 = -5((-6 * 3 + x * 3) + x(-6 + x))
40 = -5((-18 + 3x) + x(-6 + x))
40 = -5(-18 + 3x + (-6 * x + x * x))
40 = -5(-18 + 3x + (-6x + x2))

Combine like terms: 3x + -6x = -3x
40 = -5(-18 + -3x + x2)
40 = (-18 * -5 + -3x * -5 + x2 * -5)
40 = (90 + 15x + -5x2)

Solving
40 = 90 + 15x + -5x2

Solving for variable 'x'.

Combine like terms: 40 + -90 = -50
-50 + -15x + 5x2 = 90 + 15x + -5x2 + -90 + -15x + 5x2

Reorder the terms:
-50 + -15x + 5x2 = 90 + -90 + 15x + -15x + -5x2 + 5x2

Combine like terms: 90 + -90 = 0
-50 + -15x + 5x2 = 0 + 15x + -15x + -5x2 + 5x2
-50 + -15x + 5x2 = 15x + -15x + -5x2 + 5x2

Combine like terms: 15x + -15x = 0
-50 + -15x + 5x2 = 0 + -5x2 + 5x2
-50 + -15x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
-50 + -15x + 5x2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(-10 + -3x + x2) = 0

Factor a trinomial.
5((-2 + -1x)(5 + -1x)) = 0

Ignore the factor 5.

Subproblem 1

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

Subproblem 2

Set the factor '(5 + -1x)' equal to zero and attempt to solve: Simplifying 5 + -1x = 0 Solving 5 + -1x = 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 + -1x = 0 + -5 Combine like terms: 5 + -5 = 0 0 + -1x = 0 + -5 -1x = 0 + -5 Combine like terms: 0 + -5 = -5 -1x = -5 Divide each side by '-1'. x = 5 Simplifying x = 5

Solution

x = {-2, 5}

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