(x-8)(4x+5)=0

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Solution for (x-8)(4x+5)=0 equation:


Simplifying
(x + -8)(4x + 5) = 0

Reorder the terms:
(-8 + x)(4x + 5) = 0

Reorder the terms:
(-8 + x)(5 + 4x) = 0

Multiply (-8 + x) * (5 + 4x)
(-8(5 + 4x) + x(5 + 4x)) = 0
((5 * -8 + 4x * -8) + x(5 + 4x)) = 0
((-40 + -32x) + x(5 + 4x)) = 0
(-40 + -32x + (5 * x + 4x * x)) = 0
(-40 + -32x + (5x + 4x2)) = 0

Combine like terms: -32x + 5x = -27x
(-40 + -27x + 4x2) = 0

Solving
-40 + -27x + 4x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-5 + -4x)(8 + -1x) = 0

Subproblem 1

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

Subproblem 2

Set the factor '(8 + -1x)' equal to zero and attempt to solve: Simplifying 8 + -1x = 0 Solving 8 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + -1x = 0 + -8 Combine like terms: 8 + -8 = 0 0 + -1x = 0 + -8 -1x = 0 + -8 Combine like terms: 0 + -8 = -8 -1x = -8 Divide each side by '-1'. x = 8 Simplifying x = 8

Solution

x = {-1.25, 8}

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