(-7x-6)(x-5)+(8x-9)=

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Solution for (-7x-6)(x-5)+(8x-9)= equation:


Simplifying
(-7x + -6)(x + -5) + (8x + -9) = 0

Reorder the terms:
(-6 + -7x)(x + -5) + (8x + -9) = 0

Reorder the terms:
(-6 + -7x)(-5 + x) + (8x + -9) = 0

Multiply (-6 + -7x) * (-5 + x)
(-6(-5 + x) + -7x * (-5 + x)) + (8x + -9) = 0
((-5 * -6 + x * -6) + -7x * (-5 + x)) + (8x + -9) = 0
((30 + -6x) + -7x * (-5 + x)) + (8x + -9) = 0
(30 + -6x + (-5 * -7x + x * -7x)) + (8x + -9) = 0
(30 + -6x + (35x + -7x2)) + (8x + -9) = 0

Combine like terms: -6x + 35x = 29x
(30 + 29x + -7x2) + (8x + -9) = 0

Reorder the terms:
30 + 29x + -7x2 + (-9 + 8x) = 0

Remove parenthesis around (-9 + 8x)
30 + 29x + -7x2 + -9 + 8x = 0

Reorder the terms:
30 + -9 + 29x + 8x + -7x2 = 0

Combine like terms: 30 + -9 = 21
21 + 29x + 8x + -7x2 = 0

Combine like terms: 29x + 8x = 37x
21 + 37x + -7x2 = 0

Solving
21 + 37x + -7x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-7 the coefficient of the squared term: 

Divide each side by '-7'.
-3 + -5.285714286x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -5.285714286x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -5.285714286x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -5.285714286x + x2 = 0 + 3
-5.285714286x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-5.285714286x + x2 = 3

The x term is -5.285714286x.  Take half its coefficient (-2.642857143).
Square it (6.984693878) and add it to both sides.

Add '6.984693878' to each side of the equation.
-5.285714286x + 6.984693878 + x2 = 3 + 6.984693878

Reorder the terms:
6.984693878 + -5.285714286x + x2 = 3 + 6.984693878

Combine like terms: 3 + 6.984693878 = 9.984693878
6.984693878 + -5.285714286x + x2 = 9.984693878

Factor a perfect square on the left side:
(x + -2.642857143)(x + -2.642857143) = 9.984693878

Calculate the square root of the right side: 3.159856623

Break this problem into two subproblems by setting 
(x + -2.642857143) equal to 3.159856623 and -3.159856623.

Subproblem 1

x + -2.642857143 = 3.159856623 Simplifying x + -2.642857143 = 3.159856623 Reorder the terms: -2.642857143 + x = 3.159856623 Solving -2.642857143 + x = 3.159856623 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.642857143' to each side of the equation. -2.642857143 + 2.642857143 + x = 3.159856623 + 2.642857143 Combine like terms: -2.642857143 + 2.642857143 = 0.000000000 0.000000000 + x = 3.159856623 + 2.642857143 x = 3.159856623 + 2.642857143 Combine like terms: 3.159856623 + 2.642857143 = 5.802713766 x = 5.802713766 Simplifying x = 5.802713766

Subproblem 2

x + -2.642857143 = -3.159856623 Simplifying x + -2.642857143 = -3.159856623 Reorder the terms: -2.642857143 + x = -3.159856623 Solving -2.642857143 + x = -3.159856623 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.642857143' to each side of the equation. -2.642857143 + 2.642857143 + x = -3.159856623 + 2.642857143 Combine like terms: -2.642857143 + 2.642857143 = 0.000000000 0.000000000 + x = -3.159856623 + 2.642857143 x = -3.159856623 + 2.642857143 Combine like terms: -3.159856623 + 2.642857143 = -0.51699948 x = -0.51699948 Simplifying x = -0.51699948

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.802713766, -0.51699948}

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