6x(x+9)=(2x+8)(x+9)

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Solution for 6x(x+9)=(2x+8)(x+9) equation:


Simplifying
6x(x + 9) = (2x + 8)(x + 9)

Reorder the terms:
6x(9 + x) = (2x + 8)(x + 9)
(9 * 6x + x * 6x) = (2x + 8)(x + 9)
(54x + 6x2) = (2x + 8)(x + 9)

Reorder the terms:
54x + 6x2 = (8 + 2x)(x + 9)

Reorder the terms:
54x + 6x2 = (8 + 2x)(9 + x)

Multiply (8 + 2x) * (9 + x)
54x + 6x2 = (8(9 + x) + 2x * (9 + x))
54x + 6x2 = ((9 * 8 + x * 8) + 2x * (9 + x))
54x + 6x2 = ((72 + 8x) + 2x * (9 + x))
54x + 6x2 = (72 + 8x + (9 * 2x + x * 2x))
54x + 6x2 = (72 + 8x + (18x + 2x2))

Combine like terms: 8x + 18x = 26x
54x + 6x2 = (72 + 26x + 2x2)

Solving
54x + 6x2 = 72 + 26x + 2x2

Solving for variable 'x'.

Reorder the terms:
-72 + 54x + -26x + 6x2 + -2x2 = 72 + 26x + 2x2 + -72 + -26x + -2x2

Combine like terms: 54x + -26x = 28x
-72 + 28x + 6x2 + -2x2 = 72 + 26x + 2x2 + -72 + -26x + -2x2

Combine like terms: 6x2 + -2x2 = 4x2
-72 + 28x + 4x2 = 72 + 26x + 2x2 + -72 + -26x + -2x2

Reorder the terms:
-72 + 28x + 4x2 = 72 + -72 + 26x + -26x + 2x2 + -2x2

Combine like terms: 72 + -72 = 0
-72 + 28x + 4x2 = 0 + 26x + -26x + 2x2 + -2x2
-72 + 28x + 4x2 = 26x + -26x + 2x2 + -2x2

Combine like terms: 26x + -26x = 0
-72 + 28x + 4x2 = 0 + 2x2 + -2x2
-72 + 28x + 4x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-72 + 28x + 4x2 = 0

Factor out the Greatest Common Factor (GCF), '4'.
4(-18 + 7x + x2) = 0

Factor a trinomial.
4((-9 + -1x)(2 + -1x)) = 0

Ignore the factor 4.

Subproblem 1

Set the factor '(-9 + -1x)' equal to zero and attempt to solve: Simplifying -9 + -1x = 0 Solving -9 + -1x = 0 Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + -1x = 0 + 9 -1x = 0 + 9 Combine like terms: 0 + 9 = 9 -1x = 9 Divide each side by '-1'. x = -9 Simplifying x = -9

Subproblem 2

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

Solution

x = {-9, 2}

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