5x(3x+17)=2(-8-x)

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Solution for 5x(3x+17)=2(-8-x) equation:


Simplifying
5x(3x + 17) = 2(-8 + -1x)

Reorder the terms:
5x(17 + 3x) = 2(-8 + -1x)
(17 * 5x + 3x * 5x) = 2(-8 + -1x)
(85x + 15x2) = 2(-8 + -1x)
85x + 15x2 = (-8 * 2 + -1x * 2)
85x + 15x2 = (-16 + -2x)

Solving
85x + 15x2 = -16 + -2x

Solving for variable 'x'.

Reorder the terms:
16 + 85x + 2x + 15x2 = -16 + -2x + 16 + 2x

Combine like terms: 85x + 2x = 87x
16 + 87x + 15x2 = -16 + -2x + 16 + 2x

Reorder the terms:
16 + 87x + 15x2 = -16 + 16 + -2x + 2x

Combine like terms: -16 + 16 = 0
16 + 87x + 15x2 = 0 + -2x + 2x
16 + 87x + 15x2 = -2x + 2x

Combine like terms: -2x + 2x = 0
16 + 87x + 15x2 = 0

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

Divide each side by '15'.
1.066666667 + 5.8x + x2 = 0

Move the constant term to the right:

Add '-1.066666667' to each side of the equation.
1.066666667 + 5.8x + -1.066666667 + x2 = 0 + -1.066666667

Reorder the terms:
1.066666667 + -1.066666667 + 5.8x + x2 = 0 + -1.066666667

Combine like terms: 1.066666667 + -1.066666667 = 0.000000000
0.000000000 + 5.8x + x2 = 0 + -1.066666667
5.8x + x2 = 0 + -1.066666667

Combine like terms: 0 + -1.066666667 = -1.066666667
5.8x + x2 = -1.066666667

The x term is 5.8x.  Take half its coefficient (2.9).
Square it (8.41) and add it to both sides.

Add '8.41' to each side of the equation.
5.8x + 8.41 + x2 = -1.066666667 + 8.41

Reorder the terms:
8.41 + 5.8x + x2 = -1.066666667 + 8.41

Combine like terms: -1.066666667 + 8.41 = 7.343333333
8.41 + 5.8x + x2 = 7.343333333

Factor a perfect square on the left side:
(x + 2.9)(x + 2.9) = 7.343333333

Calculate the square root of the right side: 2.709858545

Break this problem into two subproblems by setting 
(x + 2.9) equal to 2.709858545 and -2.709858545.

Subproblem 1

x + 2.9 = 2.709858545 Simplifying x + 2.9 = 2.709858545 Reorder the terms: 2.9 + x = 2.709858545 Solving 2.9 + x = 2.709858545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.9' to each side of the equation. 2.9 + -2.9 + x = 2.709858545 + -2.9 Combine like terms: 2.9 + -2.9 = 0.0 0.0 + x = 2.709858545 + -2.9 x = 2.709858545 + -2.9 Combine like terms: 2.709858545 + -2.9 = -0.190141455 x = -0.190141455 Simplifying x = -0.190141455

Subproblem 2

x + 2.9 = -2.709858545 Simplifying x + 2.9 = -2.709858545 Reorder the terms: 2.9 + x = -2.709858545 Solving 2.9 + x = -2.709858545 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.9' to each side of the equation. 2.9 + -2.9 + x = -2.709858545 + -2.9 Combine like terms: 2.9 + -2.9 = 0.0 0.0 + x = -2.709858545 + -2.9 x = -2.709858545 + -2.9 Combine like terms: -2.709858545 + -2.9 = -5.609858545 x = -5.609858545 Simplifying x = -5.609858545

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.190141455, -5.609858545}

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