x^2+10x+9=2x-1

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Solution for x^2+10x+9=2x-1 equation:


Simplifying
x2 + 10x + 9 = 2x + -1

Reorder the terms:
9 + 10x + x2 = 2x + -1

Reorder the terms:
9 + 10x + x2 = -1 + 2x

Solving
9 + 10x + x2 = -1 + 2x

Solving for variable 'x'.

Reorder the terms:
9 + 1 + 10x + -2x + x2 = -1 + 2x + 1 + -2x

Combine like terms: 9 + 1 = 10
10 + 10x + -2x + x2 = -1 + 2x + 1 + -2x

Combine like terms: 10x + -2x = 8x
10 + 8x + x2 = -1 + 2x + 1 + -2x

Reorder the terms:
10 + 8x + x2 = -1 + 1 + 2x + -2x

Combine like terms: -1 + 1 = 0
10 + 8x + x2 = 0 + 2x + -2x
10 + 8x + x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
10 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-10' to each side of the equation.
10 + 8x + -10 + x2 = 0 + -10

Reorder the terms:
10 + -10 + 8x + x2 = 0 + -10

Combine like terms: 10 + -10 = 0
0 + 8x + x2 = 0 + -10
8x + x2 = 0 + -10

Combine like terms: 0 + -10 = -10
8x + x2 = -10

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = -10 + 16

Reorder the terms:
16 + 8x + x2 = -10 + 16

Combine like terms: -10 + 16 = 6
16 + 8x + x2 = 6

Factor a perfect square on the left side:
(x + 4)(x + 4) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(x + 4) equal to 2.449489743 and -2.449489743.

Subproblem 1

x + 4 = 2.449489743 Simplifying x + 4 = 2.449489743 Reorder the terms: 4 + x = 2.449489743 Solving 4 + x = 2.449489743 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 2.449489743 + -4 Combine like terms: 4 + -4 = 0 0 + x = 2.449489743 + -4 x = 2.449489743 + -4 Combine like terms: 2.449489743 + -4 = -1.550510257 x = -1.550510257 Simplifying x = -1.550510257

Subproblem 2

x + 4 = -2.449489743 Simplifying x + 4 = -2.449489743 Reorder the terms: 4 + x = -2.449489743 Solving 4 + x = -2.449489743 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -2.449489743 + -4 Combine like terms: 4 + -4 = 0 0 + x = -2.449489743 + -4 x = -2.449489743 + -4 Combine like terms: -2.449489743 + -4 = -6.449489743 x = -6.449489743 Simplifying x = -6.449489743

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.550510257, -6.449489743}

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