8x^2+22x-45=0

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Solution for 8x^2+22x-45=0 equation:


Simplifying
8x2 + 22x + -45 = 0

Reorder the terms:
-45 + 22x + 8x2 = 0

Solving
-45 + 22x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-5.625 + 2.75x + x2 = 0

Move the constant term to the right:

Add '5.625' to each side of the equation.
-5.625 + 2.75x + 5.625 + x2 = 0 + 5.625

Reorder the terms:
-5.625 + 5.625 + 2.75x + x2 = 0 + 5.625

Combine like terms: -5.625 + 5.625 = 0.000
0.000 + 2.75x + x2 = 0 + 5.625
2.75x + x2 = 0 + 5.625

Combine like terms: 0 + 5.625 = 5.625
2.75x + x2 = 5.625

The x term is 2.75x.  Take half its coefficient (1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
2.75x + 1.890625 + x2 = 5.625 + 1.890625

Reorder the terms:
1.890625 + 2.75x + x2 = 5.625 + 1.890625

Combine like terms: 5.625 + 1.890625 = 7.515625
1.890625 + 2.75x + x2 = 7.515625

Factor a perfect square on the left side:
(x + 1.375)(x + 1.375) = 7.515625

Calculate the square root of the right side: 2.741464025

Break this problem into two subproblems by setting 
(x + 1.375) equal to 2.741464025 and -2.741464025.

Subproblem 1

x + 1.375 = 2.741464025 Simplifying x + 1.375 = 2.741464025 Reorder the terms: 1.375 + x = 2.741464025 Solving 1.375 + x = 2.741464025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = 2.741464025 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = 2.741464025 + -1.375 x = 2.741464025 + -1.375 Combine like terms: 2.741464025 + -1.375 = 1.366464025 x = 1.366464025 Simplifying x = 1.366464025

Subproblem 2

x + 1.375 = -2.741464025 Simplifying x + 1.375 = -2.741464025 Reorder the terms: 1.375 + x = -2.741464025 Solving 1.375 + x = -2.741464025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + x = -2.741464025 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + x = -2.741464025 + -1.375 x = -2.741464025 + -1.375 Combine like terms: -2.741464025 + -1.375 = -4.116464025 x = -4.116464025 Simplifying x = -4.116464025

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.366464025, -4.116464025}

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