2x+1=x^2+2.6x+0.45

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Solution for 2x+1=x^2+2.6x+0.45 equation:


Simplifying
2x + 1 = x2 + 2.6x + 0.45

Reorder the terms:
1 + 2x = x2 + 2.6x + 0.45

Reorder the terms:
1 + 2x = 0.45 + 2.6x + x2

Solving
1 + 2x = 0.45 + 2.6x + x2

Solving for variable 'x'.

Reorder the terms:
1 + -0.45 + 2x + -2.6x + -1x2 = 0.45 + 2.6x + x2 + -0.45 + -2.6x + -1x2

Combine like terms: 1 + -0.45 = 0.55
0.55 + 2x + -2.6x + -1x2 = 0.45 + 2.6x + x2 + -0.45 + -2.6x + -1x2

Combine like terms: 2x + -2.6x = -0.6x
0.55 + -0.6x + -1x2 = 0.45 + 2.6x + x2 + -0.45 + -2.6x + -1x2

Reorder the terms:
0.55 + -0.6x + -1x2 = 0.45 + -0.45 + 2.6x + -2.6x + x2 + -1x2

Combine like terms: 0.45 + -0.45 = 0.00
0.55 + -0.6x + -1x2 = 0.00 + 2.6x + -2.6x + x2 + -1x2
0.55 + -0.6x + -1x2 = 2.6x + -2.6x + x2 + -1x2

Combine like terms: 2.6x + -2.6x = 0.0
0.55 + -0.6x + -1x2 = 0.0 + x2 + -1x2
0.55 + -0.6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
0.55 + -0.6x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-0.55 + 0.6x + x2 = 0

Move the constant term to the right:

Add '0.55' to each side of the equation.
-0.55 + 0.6x + 0.55 + x2 = 0 + 0.55

Reorder the terms:
-0.55 + 0.55 + 0.6x + x2 = 0 + 0.55

Combine like terms: -0.55 + 0.55 = 0.00
0.00 + 0.6x + x2 = 0 + 0.55
0.6x + x2 = 0 + 0.55

Combine like terms: 0 + 0.55 = 0.55
0.6x + x2 = 0.55

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 0.55 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 0.55 + 0.09

Combine like terms: 0.55 + 0.09 = 0.64
0.09 + 0.6x + x2 = 0.64

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 0.64

Calculate the square root of the right side: 0.8

Break this problem into two subproblems by setting 
(x + 0.3) equal to 0.8 and -0.8.

Subproblem 1

x + 0.3 = 0.8 Simplifying x + 0.3 = 0.8 Reorder the terms: 0.3 + x = 0.8 Solving 0.3 + x = 0.8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 0.8 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 0.8 + -0.3 x = 0.8 + -0.3 Combine like terms: 0.8 + -0.3 = 0.5 x = 0.5 Simplifying x = 0.5

Subproblem 2

x + 0.3 = -0.8 Simplifying x + 0.3 = -0.8 Reorder the terms: 0.3 + x = -0.8 Solving 0.3 + x = -0.8 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -0.8 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -0.8 + -0.3 x = -0.8 + -0.3 Combine like terms: -0.8 + -0.3 = -1.1 x = -1.1 Simplifying x = -1.1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5, -1.1}

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