x(2x+0.15)+(x+0.05)=1.8

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Solution for x(2x+0.15)+(x+0.05)=1.8 equation:


Simplifying
x(2x + 0.15) + (x + 0.05) = 1.8

Reorder the terms:
x(0.15 + 2x) + (x + 0.05) = 1.8
(0.15 * x + 2x * x) + (x + 0.05) = 1.8
(0.15x + 2x2) + (x + 0.05) = 1.8

Reorder the terms:
0.15x + 2x2 + (0.05 + x) = 1.8

Remove parenthesis around (0.05 + x)
0.15x + 2x2 + 0.05 + x = 1.8

Reorder the terms:
0.05 + 0.15x + x + 2x2 = 1.8

Combine like terms: 0.15x + x = 1.15x
0.05 + 1.15x + 2x2 = 1.8

Solving
0.05 + 1.15x + 2x2 = 1.8

Solving for variable 'x'.

Reorder the terms:
0.05 + -1.8 + 1.15x + 2x2 = 1.8 + -1.8

Combine like terms: 0.05 + -1.8 = -1.75
-1.75 + 1.15x + 2x2 = 1.8 + -1.8

Combine like terms: 1.8 + -1.8 = 0.0
-1.75 + 1.15x + 2x2 = 0.0

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

Divide each side by '2'.
-0.875 + 0.575x + x2 = 0.0

Move the constant term to the right:

Add '0.875' to each side of the equation.
-0.875 + 0.575x + 0.875 + x2 = 0.0 + 0.875

Reorder the terms:
-0.875 + 0.875 + 0.575x + x2 = 0.0 + 0.875

Combine like terms: -0.875 + 0.875 = 0.000
0.000 + 0.575x + x2 = 0.0 + 0.875
0.575x + x2 = 0.0 + 0.875

Combine like terms: 0.0 + 0.875 = 0.875
0.575x + x2 = 0.875

The x term is 0.575x.  Take half its coefficient (0.2875).
Square it (0.08265625) and add it to both sides.

Add '0.08265625' to each side of the equation.
0.575x + 0.08265625 + x2 = 0.875 + 0.08265625

Reorder the terms:
0.08265625 + 0.575x + x2 = 0.875 + 0.08265625

Combine like terms: 0.875 + 0.08265625 = 0.95765625
0.08265625 + 0.575x + x2 = 0.95765625

Factor a perfect square on the left side:
(x + 0.2875)(x + 0.2875) = 0.95765625

Calculate the square root of the right side: 0.978599126

Break this problem into two subproblems by setting 
(x + 0.2875) equal to 0.978599126 and -0.978599126.

Subproblem 1

x + 0.2875 = 0.978599126 Simplifying x + 0.2875 = 0.978599126 Reorder the terms: 0.2875 + x = 0.978599126 Solving 0.2875 + x = 0.978599126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2875' to each side of the equation. 0.2875 + -0.2875 + x = 0.978599126 + -0.2875 Combine like terms: 0.2875 + -0.2875 = 0.0000 0.0000 + x = 0.978599126 + -0.2875 x = 0.978599126 + -0.2875 Combine like terms: 0.978599126 + -0.2875 = 0.691099126 x = 0.691099126 Simplifying x = 0.691099126

Subproblem 2

x + 0.2875 = -0.978599126 Simplifying x + 0.2875 = -0.978599126 Reorder the terms: 0.2875 + x = -0.978599126 Solving 0.2875 + x = -0.978599126 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2875' to each side of the equation. 0.2875 + -0.2875 + x = -0.978599126 + -0.2875 Combine like terms: 0.2875 + -0.2875 = 0.0000 0.0000 + x = -0.978599126 + -0.2875 x = -0.978599126 + -0.2875 Combine like terms: -0.978599126 + -0.2875 = -1.266099126 x = -1.266099126 Simplifying x = -1.266099126

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.691099126, -1.266099126}

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