x^2+2x-9.24=0

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Solution for x^2+2x-9.24=0 equation:


Simplifying
x2 + 2x + -9.24 = 0

Reorder the terms:
-9.24 + 2x + x2 = 0

Solving
-9.24 + 2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '9.24' to each side of the equation.
-9.24 + 2x + 9.24 + x2 = 0 + 9.24

Reorder the terms:
-9.24 + 9.24 + 2x + x2 = 0 + 9.24

Combine like terms: -9.24 + 9.24 = 0.00
0.00 + 2x + x2 = 0 + 9.24
2x + x2 = 0 + 9.24

Combine like terms: 0 + 9.24 = 9.24
2x + x2 = 9.24

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 = 9.24 + 1

Reorder the terms:
1 + 2x + x2 = 9.24 + 1

Combine like terms: 9.24 + 1 = 10.24
1 + 2x + x2 = 10.24

Factor a perfect square on the left side:
(x + 1)(x + 1) = 10.24

Calculate the square root of the right side: 3.2

Break this problem into two subproblems by setting 
(x + 1) equal to 3.2 and -3.2.

Subproblem 1

x + 1 = 3.2 Simplifying x + 1 = 3.2 Reorder the terms: 1 + x = 3.2 Solving 1 + x = 3.2 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 = 3.2 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.2 + -1 x = 3.2 + -1 Combine like terms: 3.2 + -1 = 2.2 x = 2.2 Simplifying x = 2.2

Subproblem 2

x + 1 = -3.2 Simplifying x + 1 = -3.2 Reorder the terms: 1 + x = -3.2 Solving 1 + x = -3.2 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 = -3.2 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.2 + -1 x = -3.2 + -1 Combine like terms: -3.2 + -1 = -4.2 x = -4.2 Simplifying x = -4.2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.2, -4.2}

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