5x^2+7x-13=0

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Solution for 5x^2+7x-13=0 equation:


Simplifying
5x2 + 7x + -13 = 0

Reorder the terms:
-13 + 7x + 5x2 = 0

Solving
-13 + 7x + 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 + 1.4x + x2 = 0

Move the constant term to the right:

Add '2.6' to each side of the equation.
-2.6 + 1.4x + 2.6 + x2 = 0 + 2.6

Reorder the terms:
-2.6 + 2.6 + 1.4x + x2 = 0 + 2.6

Combine like terms: -2.6 + 2.6 = 0.0
0.0 + 1.4x + x2 = 0 + 2.6
1.4x + x2 = 0 + 2.6

Combine like terms: 0 + 2.6 = 2.6
1.4x + x2 = 2.6

The x term is 1.4x.  Take half its coefficient (0.7).
Square it (0.49) and add it to both sides.

Add '0.49' to each side of the equation.
1.4x + 0.49 + x2 = 2.6 + 0.49

Reorder the terms:
0.49 + 1.4x + x2 = 2.6 + 0.49

Combine like terms: 2.6 + 0.49 = 3.09
0.49 + 1.4x + x2 = 3.09

Factor a perfect square on the left side:
(x + 0.7)(x + 0.7) = 3.09

Calculate the square root of the right side: 1.757839583

Break this problem into two subproblems by setting 
(x + 0.7) equal to 1.757839583 and -1.757839583.

Subproblem 1

x + 0.7 = 1.757839583 Simplifying x + 0.7 = 1.757839583 Reorder the terms: 0.7 + x = 1.757839583 Solving 0.7 + x = 1.757839583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + x = 1.757839583 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = 1.757839583 + -0.7 x = 1.757839583 + -0.7 Combine like terms: 1.757839583 + -0.7 = 1.057839583 x = 1.057839583 Simplifying x = 1.057839583

Subproblem 2

x + 0.7 = -1.757839583 Simplifying x + 0.7 = -1.757839583 Reorder the terms: 0.7 + x = -1.757839583 Solving 0.7 + x = -1.757839583 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7' to each side of the equation. 0.7 + -0.7 + x = -1.757839583 + -0.7 Combine like terms: 0.7 + -0.7 = 0.0 0.0 + x = -1.757839583 + -0.7 x = -1.757839583 + -0.7 Combine like terms: -1.757839583 + -0.7 = -2.457839583 x = -2.457839583 Simplifying x = -2.457839583

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.057839583, -2.457839583}

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