9x(x-4)=(2x+7)(x-4)

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Solution for 9x(x-4)=(2x+7)(x-4) equation:


Simplifying
9x(x + -4) = (2x + 7)(x + -4)

Reorder the terms:
9x(-4 + x) = (2x + 7)(x + -4)
(-4 * 9x + x * 9x) = (2x + 7)(x + -4)
(-36x + 9x2) = (2x + 7)(x + -4)

Reorder the terms:
-36x + 9x2 = (7 + 2x)(x + -4)

Reorder the terms:
-36x + 9x2 = (7 + 2x)(-4 + x)

Multiply (7 + 2x) * (-4 + x)
-36x + 9x2 = (7(-4 + x) + 2x * (-4 + x))
-36x + 9x2 = ((-4 * 7 + x * 7) + 2x * (-4 + x))
-36x + 9x2 = ((-28 + 7x) + 2x * (-4 + x))
-36x + 9x2 = (-28 + 7x + (-4 * 2x + x * 2x))
-36x + 9x2 = (-28 + 7x + (-8x + 2x2))

Combine like terms: 7x + -8x = -1x
-36x + 9x2 = (-28 + -1x + 2x2)

Solving
-36x + 9x2 = -28 + -1x + 2x2

Solving for variable 'x'.

Reorder the terms:
28 + -36x + x + 9x2 + -2x2 = -28 + -1x + 2x2 + 28 + x + -2x2

Combine like terms: -36x + x = -35x
28 + -35x + 9x2 + -2x2 = -28 + -1x + 2x2 + 28 + x + -2x2

Combine like terms: 9x2 + -2x2 = 7x2
28 + -35x + 7x2 = -28 + -1x + 2x2 + 28 + x + -2x2

Reorder the terms:
28 + -35x + 7x2 = -28 + 28 + -1x + x + 2x2 + -2x2

Combine like terms: -28 + 28 = 0
28 + -35x + 7x2 = 0 + -1x + x + 2x2 + -2x2
28 + -35x + 7x2 = -1x + x + 2x2 + -2x2

Combine like terms: -1x + x = 0
28 + -35x + 7x2 = 0 + 2x2 + -2x2
28 + -35x + 7x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
28 + -35x + 7x2 = 0

Factor out the Greatest Common Factor (GCF), '7'.
7(4 + -5x + x2) = 0

Factor a trinomial.
7((1 + -1x)(4 + -1x)) = 0

Ignore the factor 7.

Subproblem 1

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

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 = {1, 4}

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