x+x+1.5x(3.5x-8)=90

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Solution for x+x+1.5x(3.5x-8)=90 equation:


Simplifying
x + x + 1.5x(3.5x + -8) = 90

Reorder the terms:
x + x + 1.5x(-8 + 3.5x) = 90
x + x + (-8 * 1.5x + 3.5x * 1.5x) = 90
x + x + (-12x + 5.25x2) = 90

Combine like terms: x + x = 2x
2x + -12x + 5.25x2 = 90

Combine like terms: 2x + -12x = -10x
-10x + 5.25x2 = 90

Solving
-10x + 5.25x2 = 90

Solving for variable 'x'.

Reorder the terms:
-90 + -10x + 5.25x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-90 + -10x + 5.25x2 = 0

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

Divide each side by '5.25'.
-17.14285714 + -1.904761905x + x2 = 0

Move the constant term to the right:

Add '17.14285714' to each side of the equation.
-17.14285714 + -1.904761905x + 17.14285714 + x2 = 0 + 17.14285714

Reorder the terms:
-17.14285714 + 17.14285714 + -1.904761905x + x2 = 0 + 17.14285714

Combine like terms: -17.14285714 + 17.14285714 = 0.00000000
0.00000000 + -1.904761905x + x2 = 0 + 17.14285714
-1.904761905x + x2 = 0 + 17.14285714

Combine like terms: 0 + 17.14285714 = 17.14285714
-1.904761905x + x2 = 17.14285714

The x term is -1.904761905x.  Take half its coefficient (-0.9523809525).
Square it (0.9070294787) and add it to both sides.

Add '0.9070294787' to each side of the equation.
-1.904761905x + 0.9070294787 + x2 = 17.14285714 + 0.9070294787

Reorder the terms:
0.9070294787 + -1.904761905x + x2 = 17.14285714 + 0.9070294787

Combine like terms: 17.14285714 + 0.9070294787 = 18.0498866187
0.9070294787 + -1.904761905x + x2 = 18.0498866187

Factor a perfect square on the left side:
(x + -0.9523809525)(x + -0.9523809525) = 18.0498866187

Calculate the square root of the right side: 4.248515814

Break this problem into two subproblems by setting 
(x + -0.9523809525) equal to 4.248515814 and -4.248515814.

Subproblem 1

x + -0.9523809525 = 4.248515814 Simplifying x + -0.9523809525 = 4.248515814 Reorder the terms: -0.9523809525 + x = 4.248515814 Solving -0.9523809525 + x = 4.248515814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9523809525' to each side of the equation. -0.9523809525 + 0.9523809525 + x = 4.248515814 + 0.9523809525 Combine like terms: -0.9523809525 + 0.9523809525 = 0.0000000000 0.0000000000 + x = 4.248515814 + 0.9523809525 x = 4.248515814 + 0.9523809525 Combine like terms: 4.248515814 + 0.9523809525 = 5.2008967665 x = 5.2008967665 Simplifying x = 5.2008967665

Subproblem 2

x + -0.9523809525 = -4.248515814 Simplifying x + -0.9523809525 = -4.248515814 Reorder the terms: -0.9523809525 + x = -4.248515814 Solving -0.9523809525 + x = -4.248515814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9523809525' to each side of the equation. -0.9523809525 + 0.9523809525 + x = -4.248515814 + 0.9523809525 Combine like terms: -0.9523809525 + 0.9523809525 = 0.0000000000 0.0000000000 + x = -4.248515814 + 0.9523809525 x = -4.248515814 + 0.9523809525 Combine like terms: -4.248515814 + 0.9523809525 = -3.2961348615 x = -3.2961348615 Simplifying x = -3.2961348615

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.2008967665, -3.2961348615}

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