(x-4)(x-7)=8x+6

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Solution for (x-4)(x-7)=8x+6 equation:


Simplifying
(x + -4)(x + -7) = 8x + 6

Reorder the terms:
(-4 + x)(x + -7) = 8x + 6

Reorder the terms:
(-4 + x)(-7 + x) = 8x + 6

Multiply (-4 + x) * (-7 + x)
(-4(-7 + x) + x(-7 + x)) = 8x + 6
((-7 * -4 + x * -4) + x(-7 + x)) = 8x + 6
((28 + -4x) + x(-7 + x)) = 8x + 6
(28 + -4x + (-7 * x + x * x)) = 8x + 6
(28 + -4x + (-7x + x2)) = 8x + 6

Combine like terms: -4x + -7x = -11x
(28 + -11x + x2) = 8x + 6

Reorder the terms:
28 + -11x + x2 = 6 + 8x

Solving
28 + -11x + x2 = 6 + 8x

Solving for variable 'x'.

Reorder the terms:
28 + -6 + -11x + -8x + x2 = 6 + 8x + -6 + -8x

Combine like terms: 28 + -6 = 22
22 + -11x + -8x + x2 = 6 + 8x + -6 + -8x

Combine like terms: -11x + -8x = -19x
22 + -19x + x2 = 6 + 8x + -6 + -8x

Reorder the terms:
22 + -19x + x2 = 6 + -6 + 8x + -8x

Combine like terms: 6 + -6 = 0
22 + -19x + x2 = 0 + 8x + -8x
22 + -19x + x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
22 + -19x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-22' to each side of the equation.
22 + -19x + -22 + x2 = 0 + -22

Reorder the terms:
22 + -22 + -19x + x2 = 0 + -22

Combine like terms: 22 + -22 = 0
0 + -19x + x2 = 0 + -22
-19x + x2 = 0 + -22

Combine like terms: 0 + -22 = -22
-19x + x2 = -22

The x term is -19x.  Take half its coefficient (-9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
-19x + 90.25 + x2 = -22 + 90.25

Reorder the terms:
90.25 + -19x + x2 = -22 + 90.25

Combine like terms: -22 + 90.25 = 68.25
90.25 + -19x + x2 = 68.25

Factor a perfect square on the left side:
(x + -9.5)(x + -9.5) = 68.25

Calculate the square root of the right side: 8.261355821

Break this problem into two subproblems by setting 
(x + -9.5) equal to 8.261355821 and -8.261355821.

Subproblem 1

x + -9.5 = 8.261355821 Simplifying x + -9.5 = 8.261355821 Reorder the terms: -9.5 + x = 8.261355821 Solving -9.5 + x = 8.261355821 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = 8.261355821 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = 8.261355821 + 9.5 x = 8.261355821 + 9.5 Combine like terms: 8.261355821 + 9.5 = 17.761355821 x = 17.761355821 Simplifying x = 17.761355821

Subproblem 2

x + -9.5 = -8.261355821 Simplifying x + -9.5 = -8.261355821 Reorder the terms: -9.5 + x = -8.261355821 Solving -9.5 + x = -8.261355821 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.5' to each side of the equation. -9.5 + 9.5 + x = -8.261355821 + 9.5 Combine like terms: -9.5 + 9.5 = 0.0 0.0 + x = -8.261355821 + 9.5 x = -8.261355821 + 9.5 Combine like terms: -8.261355821 + 9.5 = 1.238644179 x = 1.238644179 Simplifying x = 1.238644179

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.761355821, 1.238644179}

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