5(x-3)(x+8)+9(x-3)=2

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Solution for 5(x-3)(x+8)+9(x-3)=2 equation:


Simplifying
5(x + -3)(x + 8) + 9(x + -3) = 2

Reorder the terms:
5(-3 + x)(x + 8) + 9(x + -3) = 2

Reorder the terms:
5(-3 + x)(8 + x) + 9(x + -3) = 2

Multiply (-3 + x) * (8 + x)
5(-3(8 + x) + x(8 + x)) + 9(x + -3) = 2
5((8 * -3 + x * -3) + x(8 + x)) + 9(x + -3) = 2
5((-24 + -3x) + x(8 + x)) + 9(x + -3) = 2
5(-24 + -3x + (8 * x + x * x)) + 9(x + -3) = 2
5(-24 + -3x + (8x + x2)) + 9(x + -3) = 2

Combine like terms: -3x + 8x = 5x
5(-24 + 5x + x2) + 9(x + -3) = 2
(-24 * 5 + 5x * 5 + x2 * 5) + 9(x + -3) = 2
(-120 + 25x + 5x2) + 9(x + -3) = 2

Reorder the terms:
-120 + 25x + 5x2 + 9(-3 + x) = 2
-120 + 25x + 5x2 + (-3 * 9 + x * 9) = 2
-120 + 25x + 5x2 + (-27 + 9x) = 2

Reorder the terms:
-120 + -27 + 25x + 9x + 5x2 = 2

Combine like terms: -120 + -27 = -147
-147 + 25x + 9x + 5x2 = 2

Combine like terms: 25x + 9x = 34x
-147 + 34x + 5x2 = 2

Solving
-147 + 34x + 5x2 = 2

Solving for variable 'x'.

Reorder the terms:
-147 + -2 + 34x + 5x2 = 2 + -2

Combine like terms: -147 + -2 = -149
-149 + 34x + 5x2 = 2 + -2

Combine like terms: 2 + -2 = 0
-149 + 34x + 5x2 = 0

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

Divide each side by '5'.
-29.8 + 6.8x + x2 = 0

Move the constant term to the right:

Add '29.8' to each side of the equation.
-29.8 + 6.8x + 29.8 + x2 = 0 + 29.8

Reorder the terms:
-29.8 + 29.8 + 6.8x + x2 = 0 + 29.8

Combine like terms: -29.8 + 29.8 = 0.0
0.0 + 6.8x + x2 = 0 + 29.8
6.8x + x2 = 0 + 29.8

Combine like terms: 0 + 29.8 = 29.8
6.8x + x2 = 29.8

The x term is 6.8x.  Take half its coefficient (3.4).
Square it (11.56) and add it to both sides.

Add '11.56' to each side of the equation.
6.8x + 11.56 + x2 = 29.8 + 11.56

Reorder the terms:
11.56 + 6.8x + x2 = 29.8 + 11.56

Combine like terms: 29.8 + 11.56 = 41.36
11.56 + 6.8x + x2 = 41.36

Factor a perfect square on the left side:
(x + 3.4)(x + 3.4) = 41.36

Calculate the square root of the right side: 6.431174076

Break this problem into two subproblems by setting 
(x + 3.4) equal to 6.431174076 and -6.431174076.

Subproblem 1

x + 3.4 = 6.431174076 Simplifying x + 3.4 = 6.431174076 Reorder the terms: 3.4 + x = 6.431174076 Solving 3.4 + x = 6.431174076 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.4' to each side of the equation. 3.4 + -3.4 + x = 6.431174076 + -3.4 Combine like terms: 3.4 + -3.4 = 0.0 0.0 + x = 6.431174076 + -3.4 x = 6.431174076 + -3.4 Combine like terms: 6.431174076 + -3.4 = 3.031174076 x = 3.031174076 Simplifying x = 3.031174076

Subproblem 2

x + 3.4 = -6.431174076 Simplifying x + 3.4 = -6.431174076 Reorder the terms: 3.4 + x = -6.431174076 Solving 3.4 + x = -6.431174076 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.4' to each side of the equation. 3.4 + -3.4 + x = -6.431174076 + -3.4 Combine like terms: 3.4 + -3.4 = 0.0 0.0 + x = -6.431174076 + -3.4 x = -6.431174076 + -3.4 Combine like terms: -6.431174076 + -3.4 = -9.831174076 x = -9.831174076 Simplifying x = -9.831174076

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.031174076, -9.831174076}

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