1.2+0.8x(5x-3)-(2-x)=0

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Solution for 1.2+0.8x(5x-3)-(2-x)=0 equation:


Simplifying
1.2 + 0.8x(5x + -3) + -1(2 + -1x) = 0

Reorder the terms:
1.2 + 0.8x(-3 + 5x) + -1(2 + -1x) = 0
1.2 + (-3 * 0.8x + 5x * 0.8x) + -1(2 + -1x) = 0
1.2 + (-2.4x + 4x2) + -1(2 + -1x) = 0
1.2 + -2.4x + 4x2 + (2 * -1 + -1x * -1) = 0
1.2 + -2.4x + 4x2 + (-2 + 1x) = 0

Reorder the terms:
1.2 + -2 + -2.4x + 1x + 4x2 = 0

Combine like terms: 1.2 + -2 = -0.8
-0.8 + -2.4x + 1x + 4x2 = 0

Combine like terms: -2.4x + 1x = -1.4x
-0.8 + -1.4x + 4x2 = 0

Solving
-0.8 + -1.4x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-0.2 + -0.35x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.35x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.35x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.35x + x2 = 0 + 0.2
-0.35x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.35x + x2 = 0.2

The x term is -0.35x.  Take half its coefficient (-0.175).
Square it (0.030625) and add it to both sides.

Add '0.030625' to each side of the equation.
-0.35x + 0.030625 + x2 = 0.2 + 0.030625

Reorder the terms:
0.030625 + -0.35x + x2 = 0.2 + 0.030625

Combine like terms: 0.2 + 0.030625 = 0.230625
0.030625 + -0.35x + x2 = 0.230625

Factor a perfect square on the left side:
(x + -0.175)(x + -0.175) = 0.230625

Calculate the square root of the right side: 0.480234318

Break this problem into two subproblems by setting 
(x + -0.175) equal to 0.480234318 and -0.480234318.

Subproblem 1

x + -0.175 = 0.480234318 Simplifying x + -0.175 = 0.480234318 Reorder the terms: -0.175 + x = 0.480234318 Solving -0.175 + x = 0.480234318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.175' to each side of the equation. -0.175 + 0.175 + x = 0.480234318 + 0.175 Combine like terms: -0.175 + 0.175 = 0.000 0.000 + x = 0.480234318 + 0.175 x = 0.480234318 + 0.175 Combine like terms: 0.480234318 + 0.175 = 0.655234318 x = 0.655234318 Simplifying x = 0.655234318

Subproblem 2

x + -0.175 = -0.480234318 Simplifying x + -0.175 = -0.480234318 Reorder the terms: -0.175 + x = -0.480234318 Solving -0.175 + x = -0.480234318 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.175' to each side of the equation. -0.175 + 0.175 + x = -0.480234318 + 0.175 Combine like terms: -0.175 + 0.175 = 0.000 0.000 + x = -0.480234318 + 0.175 x = -0.480234318 + 0.175 Combine like terms: -0.480234318 + 0.175 = -0.305234318 x = -0.305234318 Simplifying x = -0.305234318

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.655234318, -0.305234318}

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