(-2x-1)(x+4)=0

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Solution for (-2x-1)(x+4)=0 equation:


Simplifying
(-2x + -1)(x + 4) = 0

Reorder the terms:
(-1 + -2x)(x + 4) = 0

Reorder the terms:
(-1 + -2x)(4 + x) = 0

Multiply (-1 + -2x) * (4 + x)
(-1(4 + x) + -2x * (4 + x)) = 0
((4 * -1 + x * -1) + -2x * (4 + x)) = 0
((-4 + -1x) + -2x * (4 + x)) = 0
(-4 + -1x + (4 * -2x + x * -2x)) = 0
(-4 + -1x + (-8x + -2x2)) = 0

Combine like terms: -1x + -8x = -9x
(-4 + -9x + -2x2) = 0

Solving
-4 + -9x + -2x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '-1'.
-1(4 + 9x + 2x2) = 0

Factor a trinomial.
-1((4 + x)(1 + 2x)) = 0

Ignore the factor -1.

Subproblem 1

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

Subproblem 2

Set the factor '(1 + 2x)' equal to zero and attempt to solve: Simplifying 1 + 2x = 0 Solving 1 + 2x = 0 Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 2x = 0 + -1 Combine like terms: 1 + -1 = 0 0 + 2x = 0 + -1 2x = 0 + -1 Combine like terms: 0 + -1 = -1 2x = -1 Divide each side by '2'. x = -0.5 Simplifying x = -0.5

Solution

x = {-4, -0.5}

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