5x^2-14x-13=0

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Solution for 5x^2-14x-13=0 equation:


Simplifying
5x2 + -14x + -13 = 0

Reorder the terms:
-13 + -14x + 5x2 = 0

Solving
-13 + -14x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-2.6 + -2.8x + x2 = 0

Move the constant term to the right:

Add '2.6' to each side of the equation.
-2.6 + -2.8x + 2.6 + x2 = 0 + 2.6

Reorder the terms:
-2.6 + 2.6 + -2.8x + x2 = 0 + 2.6

Combine like terms: -2.6 + 2.6 = 0.0
0.0 + -2.8x + x2 = 0 + 2.6
-2.8x + x2 = 0 + 2.6

Combine like terms: 0 + 2.6 = 2.6
-2.8x + x2 = 2.6

The x term is -2.8x.  Take half its coefficient (-1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
-2.8x + 1.96 + x2 = 2.6 + 1.96

Reorder the terms:
1.96 + -2.8x + x2 = 2.6 + 1.96

Combine like terms: 2.6 + 1.96 = 4.56
1.96 + -2.8x + x2 = 4.56

Factor a perfect square on the left side:
(x + -1.4)(x + -1.4) = 4.56

Calculate the square root of the right side: 2.13541565

Break this problem into two subproblems by setting 
(x + -1.4) equal to 2.13541565 and -2.13541565.

Subproblem 1

x + -1.4 = 2.13541565 Simplifying x + -1.4 = 2.13541565 Reorder the terms: -1.4 + x = 2.13541565 Solving -1.4 + x = 2.13541565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = 2.13541565 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = 2.13541565 + 1.4 x = 2.13541565 + 1.4 Combine like terms: 2.13541565 + 1.4 = 3.53541565 x = 3.53541565 Simplifying x = 3.53541565

Subproblem 2

x + -1.4 = -2.13541565 Simplifying x + -1.4 = -2.13541565 Reorder the terms: -1.4 + x = -2.13541565 Solving -1.4 + x = -2.13541565 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = -2.13541565 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = -2.13541565 + 1.4 x = -2.13541565 + 1.4 Combine like terms: -2.13541565 + 1.4 = -0.73541565 x = -0.73541565 Simplifying x = -0.73541565

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.53541565, -0.73541565}

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