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

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


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

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

Remove parenthesis around (-3x)
0 = (5 + 4x) * -3x

Reorder the terms for easier multiplication:
0 = -3x(5 + 4x)
0 = (5 * -3x + 4x * -3x)
0 = (-15x + -12x2)

Solving
0 = -15x + -12x2

Solving for variable 'x'.
Remove the zero:
15x + 12x2 = -15x + -12x2 + 15x + 12x2

Reorder the terms:
15x + 12x2 = -15x + 15x + -12x2 + 12x2

Combine like terms: -15x + 15x = 0
15x + 12x2 = 0 + -12x2 + 12x2
15x + 12x2 = -12x2 + 12x2

Combine like terms: -12x2 + 12x2 = 0
15x + 12x2 = 0

Factor out the Greatest Common Factor (GCF), '3x'.
3x(5 + 4x) = 0

Ignore the factor 3.

Subproblem 1

Set the factor 'x' equal to zero and attempt to solve: Simplifying x = 0 Solving x = 0 Move all terms containing x to the left, all other terms to the right. Simplifying x = 0

Subproblem 2

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

Solution

x = {0, -1.25}

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