9X^2+8X=5

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Solution for 9X^2+8X=5 equation:


Simplifying
9X2 + 8X = 5

Reorder the terms:
8X + 9X2 = 5

Solving
8X + 9X2 = 5

Solving for variable 'X'.

Reorder the terms:
-5 + 8X + 9X2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + 8X + 9X2 = 0

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

Divide each side by '9'.
-0.5555555556 + 0.8888888889X + X2 = 0

Move the constant term to the right:

Add '0.5555555556' to each side of the equation.
-0.5555555556 + 0.8888888889X + 0.5555555556 + X2 = 0 + 0.5555555556

Reorder the terms:
-0.5555555556 + 0.5555555556 + 0.8888888889X + X2 = 0 + 0.5555555556

Combine like terms: -0.5555555556 + 0.5555555556 = 0.0000000000
0.0000000000 + 0.8888888889X + X2 = 0 + 0.5555555556
0.8888888889X + X2 = 0 + 0.5555555556

Combine like terms: 0 + 0.5555555556 = 0.5555555556
0.8888888889X + X2 = 0.5555555556

The X term is 0.8888888889X.  Take half its coefficient (0.4444444445).
Square it (0.1975308642) and add it to both sides.

Add '0.1975308642' to each side of the equation.
0.8888888889X + 0.1975308642 + X2 = 0.5555555556 + 0.1975308642

Reorder the terms:
0.1975308642 + 0.8888888889X + X2 = 0.5555555556 + 0.1975308642

Combine like terms: 0.5555555556 + 0.1975308642 = 0.7530864198
0.1975308642 + 0.8888888889X + X2 = 0.7530864198

Factor a perfect square on the left side:
(X + 0.4444444445)(X + 0.4444444445) = 0.7530864198

Calculate the square root of the right side: 0.86780552

Break this problem into two subproblems by setting 
(X + 0.4444444445) equal to 0.86780552 and -0.86780552.

Subproblem 1

X + 0.4444444445 = 0.86780552 Simplifying X + 0.4444444445 = 0.86780552 Reorder the terms: 0.4444444445 + X = 0.86780552 Solving 0.4444444445 + X = 0.86780552 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.4444444445' to each side of the equation. 0.4444444445 + -0.4444444445 + X = 0.86780552 + -0.4444444445 Combine like terms: 0.4444444445 + -0.4444444445 = 0.0000000000 0.0000000000 + X = 0.86780552 + -0.4444444445 X = 0.86780552 + -0.4444444445 Combine like terms: 0.86780552 + -0.4444444445 = 0.4233610755 X = 0.4233610755 Simplifying X = 0.4233610755

Subproblem 2

X + 0.4444444445 = -0.86780552 Simplifying X + 0.4444444445 = -0.86780552 Reorder the terms: 0.4444444445 + X = -0.86780552 Solving 0.4444444445 + X = -0.86780552 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.4444444445' to each side of the equation. 0.4444444445 + -0.4444444445 + X = -0.86780552 + -0.4444444445 Combine like terms: 0.4444444445 + -0.4444444445 = 0.0000000000 0.0000000000 + X = -0.86780552 + -0.4444444445 X = -0.86780552 + -0.4444444445 Combine like terms: -0.86780552 + -0.4444444445 = -1.3122499645 X = -1.3122499645 Simplifying X = -1.3122499645

Solution

The solution to the problem is based on the solutions from the subproblems. X = {0.4233610755, -1.3122499645}

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