10x^2=9x+2

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


Simplifying
10x2 = 9x + 2

Reorder the terms:
10x2 = 2 + 9x

Solving
10x2 = 2 + 9x

Solving for variable 'x'.

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

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

Combine like terms: 2 + -2 = 0
-2 + -9x + 10x2 = 0 + 9x + -9x
-2 + -9x + 10x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-2 + -9x + 10x2 = 0

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

Divide each side by '10'.
-0.2 + -0.9x + x2 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.9x + 0.2 + x2 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.9x + x2 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.9x + x2 = 0 + 0.2
-0.9x + x2 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.9x + x2 = 0.2

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 = 0.2 + 0.2025

Reorder the terms:
0.2025 + -0.9x + x2 = 0.2 + 0.2025

Combine like terms: 0.2 + 0.2025 = 0.4025
0.2025 + -0.9x + x2 = 0.4025

Factor a perfect square on the left side:
(x + -0.45)(x + -0.45) = 0.4025

Calculate the square root of the right side: 0.634428877

Break this problem into two subproblems by setting 
(x + -0.45) equal to 0.634428877 and -0.634428877.

Subproblem 1

x + -0.45 = 0.634428877 Simplifying x + -0.45 = 0.634428877 Reorder the terms: -0.45 + x = 0.634428877 Solving -0.45 + x = 0.634428877 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 = 0.634428877 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = 0.634428877 + 0.45 x = 0.634428877 + 0.45 Combine like terms: 0.634428877 + 0.45 = 1.084428877 x = 1.084428877 Simplifying x = 1.084428877

Subproblem 2

x + -0.45 = -0.634428877 Simplifying x + -0.45 = -0.634428877 Reorder the terms: -0.45 + x = -0.634428877 Solving -0.45 + x = -0.634428877 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 = -0.634428877 + 0.45 Combine like terms: -0.45 + 0.45 = 0.00 0.00 + x = -0.634428877 + 0.45 x = -0.634428877 + 0.45 Combine like terms: -0.634428877 + 0.45 = -0.184428877 x = -0.184428877 Simplifying x = -0.184428877

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.084428877, -0.184428877}

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