0.289X^2+0.1207X=0.71

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Solution for 0.289X^2+0.1207X=0.71 equation:


Simplifying
0.289X2 + 0.1207X = 0.71

Reorder the terms:
0.1207X + 0.289X2 = 0.71

Solving
0.1207X + 0.289X2 = 0.71

Solving for variable 'X'.

Reorder the terms:
-0.71 + 0.1207X + 0.289X2 = 0.71 + -0.71

Combine like terms: 0.71 + -0.71 = 0.00
-0.71 + 0.1207X + 0.289X2 = 0.00

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

Divide each side by '0.289'.
-2.456747405 + 0.4176470588X + X2 = 0

Move the constant term to the right:

Add '2.456747405' to each side of the equation.
-2.456747405 + 0.4176470588X + 2.456747405 + X2 = 0 + 2.456747405

Reorder the terms:
-2.456747405 + 2.456747405 + 0.4176470588X + X2 = 0 + 2.456747405

Combine like terms: -2.456747405 + 2.456747405 = 0.000000000
0.000000000 + 0.4176470588X + X2 = 0 + 2.456747405
0.4176470588X + X2 = 0 + 2.456747405

Combine like terms: 0 + 2.456747405 = 2.456747405
0.4176470588X + X2 = 2.456747405

The X term is 0.4176470588X.  Take half its coefficient (0.2088235294).
Square it (0.04360726643) and add it to both sides.

Add '0.04360726643' to each side of the equation.
0.4176470588X + 0.04360726643 + X2 = 2.456747405 + 0.04360726643

Reorder the terms:
0.04360726643 + 0.4176470588X + X2 = 2.456747405 + 0.04360726643

Combine like terms: 2.456747405 + 0.04360726643 = 2.50035467143
0.04360726643 + 0.4176470588X + X2 = 2.50035467143

Factor a perfect square on the left side:
(X + 0.2088235294)(X + 0.2088235294) = 2.50035467143

Calculate the square root of the right side: 1.581250983

Break this problem into two subproblems by setting 
(X + 0.2088235294) equal to 1.581250983 and -1.581250983.

Subproblem 1

X + 0.2088235294 = 1.581250983 Simplifying X + 0.2088235294 = 1.581250983 Reorder the terms: 0.2088235294 + X = 1.581250983 Solving 0.2088235294 + X = 1.581250983 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.2088235294' to each side of the equation. 0.2088235294 + -0.2088235294 + X = 1.581250983 + -0.2088235294 Combine like terms: 0.2088235294 + -0.2088235294 = 0.0000000000 0.0000000000 + X = 1.581250983 + -0.2088235294 X = 1.581250983 + -0.2088235294 Combine like terms: 1.581250983 + -0.2088235294 = 1.3724274536 X = 1.3724274536 Simplifying X = 1.3724274536

Subproblem 2

X + 0.2088235294 = -1.581250983 Simplifying X + 0.2088235294 = -1.581250983 Reorder the terms: 0.2088235294 + X = -1.581250983 Solving 0.2088235294 + X = -1.581250983 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-0.2088235294' to each side of the equation. 0.2088235294 + -0.2088235294 + X = -1.581250983 + -0.2088235294 Combine like terms: 0.2088235294 + -0.2088235294 = 0.0000000000 0.0000000000 + X = -1.581250983 + -0.2088235294 X = -1.581250983 + -0.2088235294 Combine like terms: -1.581250983 + -0.2088235294 = -1.7900745124 X = -1.7900745124 Simplifying X = -1.7900745124

Solution

The solution to the problem is based on the solutions from the subproblems. X = {1.3724274536, -1.7900745124}

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