10x^2+9x-5=0

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Solution for 10x^2+9x-5=0 equation:


Simplifying
10x2 + 9x + -5 = 0

Reorder the terms:
-5 + 9x + 10x2 = 0

Solving
-5 + 9x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
-0.5 + 0.9x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + 0.9x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + 0.9x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + 0.9x + x2 = 0 + 0.5
0.9x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
0.9x + x2 = 0.5

The x term is 0.9x.  Take half its coefficient (0.45).
Square it (0.2025) and add it to both sides.

Add '0.2025' to each side of the equation.
0.9x + 0.2025 + x2 = 0.5 + 0.2025

Reorder the terms:
0.2025 + 0.9x + x2 = 0.5 + 0.2025

Combine like terms: 0.5 + 0.2025 = 0.7025
0.2025 + 0.9x + x2 = 0.7025

Factor a perfect square on the left side:
(x + 0.45)(x + 0.45) = 0.7025

Calculate the square root of the right side: 0.838152731

Break this problem into two subproblems by setting 
(x + 0.45) equal to 0.838152731 and -0.838152731.

Subproblem 1

x + 0.45 = 0.838152731 Simplifying x + 0.45 = 0.838152731 Reorder the terms: 0.45 + x = 0.838152731 Solving 0.45 + x = 0.838152731 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.45' to each side of the equation. 0.45 + -0.45 + x = 0.838152731 + -0.45 Combine like terms: 0.45 + -0.45 = 0.00 0.00 + x = 0.838152731 + -0.45 x = 0.838152731 + -0.45 Combine like terms: 0.838152731 + -0.45 = 0.388152731 x = 0.388152731 Simplifying x = 0.388152731

Subproblem 2

x + 0.45 = -0.838152731 Simplifying x + 0.45 = -0.838152731 Reorder the terms: 0.45 + x = -0.838152731 Solving 0.45 + x = -0.838152731 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.45' to each side of the equation. 0.45 + -0.45 + x = -0.838152731 + -0.45 Combine like terms: 0.45 + -0.45 = 0.00 0.00 + x = -0.838152731 + -0.45 x = -0.838152731 + -0.45 Combine like terms: -0.838152731 + -0.45 = -1.288152731 x = -1.288152731 Simplifying x = -1.288152731

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.388152731, -1.288152731}

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