-(x+3)(4x-5)=0

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Solution for -(x+3)(4x-5)=0 equation:


Simplifying
-1(x + 3)(4x + -5) = 0

Reorder the terms:
-1(3 + x)(4x + -5) = 0

Reorder the terms:
-1(3 + x)(-5 + 4x) = 0

Multiply (3 + x) * (-5 + 4x)
-1(3(-5 + 4x) + x(-5 + 4x)) = 0
-1((-5 * 3 + 4x * 3) + x(-5 + 4x)) = 0
-1((-15 + 12x) + x(-5 + 4x)) = 0
-1(-15 + 12x + (-5 * x + 4x * x)) = 0
-1(-15 + 12x + (-5x + 4x2)) = 0

Combine like terms: 12x + -5x = 7x
-1(-15 + 7x + 4x2) = 0
(-15 * -1 + 7x * -1 + 4x2 * -1) = 0
(15 + -7x + -4x2) = 0

Solving
15 + -7x + -4x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(5 + -4x)(3 + x) = 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 '(3 + x)' equal to zero and attempt to solve: Simplifying 3 + x = 0 Solving 3 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 0 + -3 Combine like terms: 3 + -3 = 0 0 + x = 0 + -3 x = 0 + -3 Combine like terms: 0 + -3 = -3 x = -3 Simplifying x = -3

Solution

x = {1.25, -3}

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