(x+7)(x-4)=(2x+1)(x-4)

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Solution for (x+7)(x-4)=(2x+1)(x-4) equation:


Simplifying
(x + 7)(x + -4) = (2x + 1)(x + -4)

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

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

Multiply (7 + x) * (-4 + x)
(7(-4 + x) + x(-4 + x)) = (2x + 1)(x + -4)
((-4 * 7 + x * 7) + x(-4 + x)) = (2x + 1)(x + -4)
((-28 + 7x) + x(-4 + x)) = (2x + 1)(x + -4)
(-28 + 7x + (-4 * x + x * x)) = (2x + 1)(x + -4)
(-28 + 7x + (-4x + x2)) = (2x + 1)(x + -4)

Combine like terms: 7x + -4x = 3x
(-28 + 3x + x2) = (2x + 1)(x + -4)

Reorder the terms:
-28 + 3x + x2 = (1 + 2x)(x + -4)

Reorder the terms:
-28 + 3x + x2 = (1 + 2x)(-4 + x)

Multiply (1 + 2x) * (-4 + x)
-28 + 3x + x2 = (1(-4 + x) + 2x * (-4 + x))
-28 + 3x + x2 = ((-4 * 1 + x * 1) + 2x * (-4 + x))
-28 + 3x + x2 = ((-4 + 1x) + 2x * (-4 + x))
-28 + 3x + x2 = (-4 + 1x + (-4 * 2x + x * 2x))
-28 + 3x + x2 = (-4 + 1x + (-8x + 2x2))

Combine like terms: 1x + -8x = -7x
-28 + 3x + x2 = (-4 + -7x + 2x2)

Solving
-28 + 3x + x2 = -4 + -7x + 2x2

Solving for variable 'x'.

Reorder the terms:
-28 + 4 + 3x + 7x + x2 + -2x2 = -4 + -7x + 2x2 + 4 + 7x + -2x2

Combine like terms: -28 + 4 = -24
-24 + 3x + 7x + x2 + -2x2 = -4 + -7x + 2x2 + 4 + 7x + -2x2

Combine like terms: 3x + 7x = 10x
-24 + 10x + x2 + -2x2 = -4 + -7x + 2x2 + 4 + 7x + -2x2

Combine like terms: x2 + -2x2 = -1x2
-24 + 10x + -1x2 = -4 + -7x + 2x2 + 4 + 7x + -2x2

Reorder the terms:
-24 + 10x + -1x2 = -4 + 4 + -7x + 7x + 2x2 + -2x2

Combine like terms: -4 + 4 = 0
-24 + 10x + -1x2 = 0 + -7x + 7x + 2x2 + -2x2
-24 + 10x + -1x2 = -7x + 7x + 2x2 + -2x2

Combine like terms: -7x + 7x = 0
-24 + 10x + -1x2 = 0 + 2x2 + -2x2
-24 + 10x + -1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-24 + 10x + -1x2 = 0

Factor a trinomial.
(-6 + x)(4 + -1x) = 0

Subproblem 1

Set the factor '(-6 + x)' equal to zero and attempt to solve: Simplifying -6 + x = 0 Solving -6 + x = 0 Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 0 + 6 Combine like terms: -6 + 6 = 0 0 + x = 0 + 6 x = 0 + 6 Combine like terms: 0 + 6 = 6 x = 6 Simplifying x = 6

Subproblem 2

Set the factor '(4 + -1x)' equal to zero and attempt to solve: Simplifying 4 + -1x = 0 Solving 4 + -1x = 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 + -1x = 0 + -4 Combine like terms: 4 + -4 = 0 0 + -1x = 0 + -4 -1x = 0 + -4 Combine like terms: 0 + -4 = -4 -1x = -4 Divide each side by '-1'. x = 4 Simplifying x = 4

Solution

x = {6, 4}

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