(2+x)x=1.8

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


Simplifying
(2 + x) * x = 1.8

Reorder the terms for easier multiplication:
x(2 + x) = 1.8
(2 * x + x * x) = 1.8
(2x + x2) = 1.8

Solving
2x + x2 = 1.8

Solving for variable 'x'.

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

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

Begin completing the square.

Move the constant term to the right:

Add '1.8' to each side of the equation.
-1.8 + 2x + 1.8 + x2 = 0.0 + 1.8

Reorder the terms:
-1.8 + 1.8 + 2x + x2 = 0.0 + 1.8

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

Combine like terms: 0.0 + 1.8 = 1.8
2x + x2 = 1.8

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 1.8 + 1

Reorder the terms:
1 + 2x + x2 = 1.8 + 1

Combine like terms: 1.8 + 1 = 2.8
1 + 2x + x2 = 2.8

Factor a perfect square on the left side:
(x + 1)(x + 1) = 2.8

Calculate the square root of the right side: 1.673320053

Break this problem into two subproblems by setting 
(x + 1) equal to 1.673320053 and -1.673320053.

Subproblem 1

x + 1 = 1.673320053 Simplifying x + 1 = 1.673320053 Reorder the terms: 1 + x = 1.673320053 Solving 1 + x = 1.673320053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.673320053 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.673320053 + -1 x = 1.673320053 + -1 Combine like terms: 1.673320053 + -1 = 0.673320053 x = 0.673320053 Simplifying x = 0.673320053

Subproblem 2

x + 1 = -1.673320053 Simplifying x + 1 = -1.673320053 Reorder the terms: 1 + x = -1.673320053 Solving 1 + x = -1.673320053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.673320053 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.673320053 + -1 x = -1.673320053 + -1 Combine like terms: -1.673320053 + -1 = -2.673320053 x = -2.673320053 Simplifying x = -2.673320053

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.673320053, -2.673320053}

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