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

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Solution for (3x-4)(x+5)=(x+1)(1-4x) equation:


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

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

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

Multiply (-4 + 3x) * (5 + x)
(-4(5 + x) + 3x * (5 + x)) = (x + 1)(1 + -4x)
((5 * -4 + x * -4) + 3x * (5 + x)) = (x + 1)(1 + -4x)
((-20 + -4x) + 3x * (5 + x)) = (x + 1)(1 + -4x)
(-20 + -4x + (5 * 3x + x * 3x)) = (x + 1)(1 + -4x)
(-20 + -4x + (15x + 3x2)) = (x + 1)(1 + -4x)

Combine like terms: -4x + 15x = 11x
(-20 + 11x + 3x2) = (x + 1)(1 + -4x)

Reorder the terms:
-20 + 11x + 3x2 = (1 + x)(1 + -4x)

Multiply (1 + x) * (1 + -4x)
-20 + 11x + 3x2 = (1(1 + -4x) + x(1 + -4x))
-20 + 11x + 3x2 = ((1 * 1 + -4x * 1) + x(1 + -4x))
-20 + 11x + 3x2 = ((1 + -4x) + x(1 + -4x))
-20 + 11x + 3x2 = (1 + -4x + (1 * x + -4x * x))
-20 + 11x + 3x2 = (1 + -4x + (1x + -4x2))

Combine like terms: -4x + 1x = -3x
-20 + 11x + 3x2 = (1 + -3x + -4x2)

Solving
-20 + 11x + 3x2 = 1 + -3x + -4x2

Solving for variable 'x'.

Reorder the terms:
-20 + -1 + 11x + 3x + 3x2 + 4x2 = 1 + -3x + -4x2 + -1 + 3x + 4x2

Combine like terms: -20 + -1 = -21
-21 + 11x + 3x + 3x2 + 4x2 = 1 + -3x + -4x2 + -1 + 3x + 4x2

Combine like terms: 11x + 3x = 14x
-21 + 14x + 3x2 + 4x2 = 1 + -3x + -4x2 + -1 + 3x + 4x2

Combine like terms: 3x2 + 4x2 = 7x2
-21 + 14x + 7x2 = 1 + -3x + -4x2 + -1 + 3x + 4x2

Reorder the terms:
-21 + 14x + 7x2 = 1 + -1 + -3x + 3x + -4x2 + 4x2

Combine like terms: 1 + -1 = 0
-21 + 14x + 7x2 = 0 + -3x + 3x + -4x2 + 4x2
-21 + 14x + 7x2 = -3x + 3x + -4x2 + 4x2

Combine like terms: -3x + 3x = 0
-21 + 14x + 7x2 = 0 + -4x2 + 4x2
-21 + 14x + 7x2 = -4x2 + 4x2

Combine like terms: -4x2 + 4x2 = 0
-21 + 14x + 7x2 = 0

Factor out the Greatest Common Factor (GCF), '7'.
7(-3 + 2x + x2) = 0

Factor a trinomial.
7((-3 + -1x)(1 + -1x)) = 0

Ignore the factor 7.

Subproblem 1

Set the factor '(-3 + -1x)' equal to zero and attempt to solve: Simplifying -3 + -1x = 0 Solving -3 + -1x = 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 + -1x = 0 + 3 Combine like terms: -3 + 3 = 0 0 + -1x = 0 + 3 -1x = 0 + 3 Combine like terms: 0 + 3 = 3 -1x = 3 Divide each side by '-1'. x = -3 Simplifying x = -3

Subproblem 2

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

Solution

x = {-3, 1}

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