7.64x^2+2.71x=5.38

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Solution for 7.64x^2+2.71x=5.38 equation:


Simplifying
7.64x2 + 2.71x = 5.38

Reorder the terms:
2.71x + 7.64x2 = 5.38

Solving
2.71x + 7.64x2 = 5.38

Solving for variable 'x'.

Reorder the terms:
-5.38 + 2.71x + 7.64x2 = 5.38 + -5.38

Combine like terms: 5.38 + -5.38 = 0.00
-5.38 + 2.71x + 7.64x2 = 0.00

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

Divide each side by '7.64'.
-0.7041884817 + 0.3547120419x + x2 = 0

Move the constant term to the right:

Add '0.7041884817' to each side of the equation.
-0.7041884817 + 0.3547120419x + 0.7041884817 + x2 = 0 + 0.7041884817

Reorder the terms:
-0.7041884817 + 0.7041884817 + 0.3547120419x + x2 = 0 + 0.7041884817

Combine like terms: -0.7041884817 + 0.7041884817 = 0.0000000000
0.0000000000 + 0.3547120419x + x2 = 0 + 0.7041884817
0.3547120419x + x2 = 0 + 0.7041884817

Combine like terms: 0 + 0.7041884817 = 0.7041884817
0.3547120419x + x2 = 0.7041884817

The x term is 0.3547120419x.  Take half its coefficient (0.177356021).
Square it (0.03145515819) and add it to both sides.

Add '0.03145515819' to each side of the equation.
0.3547120419x + 0.03145515819 + x2 = 0.7041884817 + 0.03145515819

Reorder the terms:
0.03145515819 + 0.3547120419x + x2 = 0.7041884817 + 0.03145515819

Combine like terms: 0.7041884817 + 0.03145515819 = 0.73564363989
0.03145515819 + 0.3547120419x + x2 = 0.73564363989

Factor a perfect square on the left side:
(x + 0.177356021)(x + 0.177356021) = 0.73564363989

Calculate the square root of the right side: 0.857696706

Break this problem into two subproblems by setting 
(x + 0.177356021) equal to 0.857696706 and -0.857696706.

Subproblem 1

x + 0.177356021 = 0.857696706 Simplifying x + 0.177356021 = 0.857696706 Reorder the terms: 0.177356021 + x = 0.857696706 Solving 0.177356021 + x = 0.857696706 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.177356021' to each side of the equation. 0.177356021 + -0.177356021 + x = 0.857696706 + -0.177356021 Combine like terms: 0.177356021 + -0.177356021 = 0.000000000 0.000000000 + x = 0.857696706 + -0.177356021 x = 0.857696706 + -0.177356021 Combine like terms: 0.857696706 + -0.177356021 = 0.680340685 x = 0.680340685 Simplifying x = 0.680340685

Subproblem 2

x + 0.177356021 = -0.857696706 Simplifying x + 0.177356021 = -0.857696706 Reorder the terms: 0.177356021 + x = -0.857696706 Solving 0.177356021 + x = -0.857696706 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.177356021' to each side of the equation. 0.177356021 + -0.177356021 + x = -0.857696706 + -0.177356021 Combine like terms: 0.177356021 + -0.177356021 = 0.000000000 0.000000000 + x = -0.857696706 + -0.177356021 x = -0.857696706 + -0.177356021 Combine like terms: -0.857696706 + -0.177356021 = -1.035052727 x = -1.035052727 Simplifying x = -1.035052727

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.680340685, -1.035052727}

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