(x+4)(x-5)=6x

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Solution for (x+4)(x-5)=6x equation:


Simplifying
(x + 4)(x + -5) = 6x

Reorder the terms:
(4 + x)(x + -5) = 6x

Reorder the terms:
(4 + x)(-5 + x) = 6x

Multiply (4 + x) * (-5 + x)
(4(-5 + x) + x(-5 + x)) = 6x
((-5 * 4 + x * 4) + x(-5 + x)) = 6x
((-20 + 4x) + x(-5 + x)) = 6x
(-20 + 4x + (-5 * x + x * x)) = 6x
(-20 + 4x + (-5x + x2)) = 6x

Combine like terms: 4x + -5x = -1x
(-20 + -1x + x2) = 6x

Solving
-20 + -1x + x2 = 6x

Solving for variable 'x'.

Reorder the terms:
-20 + -1x + -6x + x2 = 6x + -6x

Combine like terms: -1x + -6x = -7x
-20 + -7x + x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-20 + -7x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + -7x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + -7x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + -7x + x2 = 0 + 20
-7x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
-7x + x2 = 20

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = 20 + 12.25

Reorder the terms:
12.25 + -7x + x2 = 20 + 12.25

Combine like terms: 20 + 12.25 = 32.25
12.25 + -7x + x2 = 32.25

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(x + -3.5) equal to 5.678908346 and -5.678908346.

Subproblem 1

x + -3.5 = 5.678908346 Simplifying x + -3.5 = 5.678908346 Reorder the terms: -3.5 + x = 5.678908346 Solving -3.5 + x = 5.678908346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 5.678908346 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 5.678908346 + 3.5 x = 5.678908346 + 3.5 Combine like terms: 5.678908346 + 3.5 = 9.178908346 x = 9.178908346 Simplifying x = 9.178908346

Subproblem 2

x + -3.5 = -5.678908346 Simplifying x + -3.5 = -5.678908346 Reorder the terms: -3.5 + x = -5.678908346 Solving -3.5 + x = -5.678908346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -5.678908346 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -5.678908346 + 3.5 x = -5.678908346 + 3.5 Combine like terms: -5.678908346 + 3.5 = -2.178908346 x = -2.178908346 Simplifying x = -2.178908346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.178908346, -2.178908346}

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