(x-1)(x-5)=7(x+8)

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Solution for (x-1)(x-5)=7(x+8) equation:


Simplifying
(x + -1)(x + -5) = 7(x + 8)

Reorder the terms:
(-1 + x)(x + -5) = 7(x + 8)

Reorder the terms:
(-1 + x)(-5 + x) = 7(x + 8)

Multiply (-1 + x) * (-5 + x)
(-1(-5 + x) + x(-5 + x)) = 7(x + 8)
((-5 * -1 + x * -1) + x(-5 + x)) = 7(x + 8)
((5 + -1x) + x(-5 + x)) = 7(x + 8)
(5 + -1x + (-5 * x + x * x)) = 7(x + 8)
(5 + -1x + (-5x + x2)) = 7(x + 8)

Combine like terms: -1x + -5x = -6x
(5 + -6x + x2) = 7(x + 8)

Reorder the terms:
5 + -6x + x2 = 7(8 + x)
5 + -6x + x2 = (8 * 7 + x * 7)
5 + -6x + x2 = (56 + 7x)

Solving
5 + -6x + x2 = 56 + 7x

Solving for variable 'x'.

Reorder the terms:
5 + -56 + -6x + -7x + x2 = 56 + 7x + -56 + -7x

Combine like terms: 5 + -56 = -51
-51 + -6x + -7x + x2 = 56 + 7x + -56 + -7x

Combine like terms: -6x + -7x = -13x
-51 + -13x + x2 = 56 + 7x + -56 + -7x

Reorder the terms:
-51 + -13x + x2 = 56 + -56 + 7x + -7x

Combine like terms: 56 + -56 = 0
-51 + -13x + x2 = 0 + 7x + -7x
-51 + -13x + x2 = 7x + -7x

Combine like terms: 7x + -7x = 0
-51 + -13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '51' to each side of the equation.
-51 + -13x + 51 + x2 = 0 + 51

Reorder the terms:
-51 + 51 + -13x + x2 = 0 + 51

Combine like terms: -51 + 51 = 0
0 + -13x + x2 = 0 + 51
-13x + x2 = 0 + 51

Combine like terms: 0 + 51 = 51
-13x + x2 = 51

The x term is -13x.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13x + 42.25 + x2 = 51 + 42.25

Reorder the terms:
42.25 + -13x + x2 = 51 + 42.25

Combine like terms: 51 + 42.25 = 93.25
42.25 + -13x + x2 = 93.25

Factor a perfect square on the left side:
(x + -6.5)(x + -6.5) = 93.25

Calculate the square root of the right side: 9.656603958

Break this problem into two subproblems by setting 
(x + -6.5) equal to 9.656603958 and -9.656603958.

Subproblem 1

x + -6.5 = 9.656603958 Simplifying x + -6.5 = 9.656603958 Reorder the terms: -6.5 + x = 9.656603958 Solving -6.5 + x = 9.656603958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = 9.656603958 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 9.656603958 + 6.5 x = 9.656603958 + 6.5 Combine like terms: 9.656603958 + 6.5 = 16.156603958 x = 16.156603958 Simplifying x = 16.156603958

Subproblem 2

x + -6.5 = -9.656603958 Simplifying x + -6.5 = -9.656603958 Reorder the terms: -6.5 + x = -9.656603958 Solving -6.5 + x = -9.656603958 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = -9.656603958 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -9.656603958 + 6.5 x = -9.656603958 + 6.5 Combine like terms: -9.656603958 + 6.5 = -3.156603958 x = -3.156603958 Simplifying x = -3.156603958

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.156603958, -3.156603958}

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