7x^2-13x-12=0

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Solution for 7x^2-13x-12=0 equation:


Simplifying
7x2 + -13x + -12 = 0

Reorder the terms:
-12 + -13x + 7x2 = 0

Solving
-12 + -13x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-1.714285714 + -1.857142857x + x2 = 0

Move the constant term to the right:

Add '1.714285714' to each side of the equation.
-1.714285714 + -1.857142857x + 1.714285714 + x2 = 0 + 1.714285714

Reorder the terms:
-1.714285714 + 1.714285714 + -1.857142857x + x2 = 0 + 1.714285714

Combine like terms: -1.714285714 + 1.714285714 = 0.000000000
0.000000000 + -1.857142857x + x2 = 0 + 1.714285714
-1.857142857x + x2 = 0 + 1.714285714

Combine like terms: 0 + 1.714285714 = 1.714285714
-1.857142857x + x2 = 1.714285714

The x term is -1.857142857x.  Take half its coefficient (-0.9285714285).
Square it (0.8622448978) and add it to both sides.

Add '0.8622448978' to each side of the equation.
-1.857142857x + 0.8622448978 + x2 = 1.714285714 + 0.8622448978

Reorder the terms:
0.8622448978 + -1.857142857x + x2 = 1.714285714 + 0.8622448978

Combine like terms: 1.714285714 + 0.8622448978 = 2.5765306118
0.8622448978 + -1.857142857x + x2 = 2.5765306118

Factor a perfect square on the left side:
(x + -0.9285714285)(x + -0.9285714285) = 2.5765306118

Calculate the square root of the right side: 1.605157504

Break this problem into two subproblems by setting 
(x + -0.9285714285) equal to 1.605157504 and -1.605157504.

Subproblem 1

x + -0.9285714285 = 1.605157504 Simplifying x + -0.9285714285 = 1.605157504 Reorder the terms: -0.9285714285 + x = 1.605157504 Solving -0.9285714285 + x = 1.605157504 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9285714285' to each side of the equation. -0.9285714285 + 0.9285714285 + x = 1.605157504 + 0.9285714285 Combine like terms: -0.9285714285 + 0.9285714285 = 0.0000000000 0.0000000000 + x = 1.605157504 + 0.9285714285 x = 1.605157504 + 0.9285714285 Combine like terms: 1.605157504 + 0.9285714285 = 2.5337289325 x = 2.5337289325 Simplifying x = 2.5337289325

Subproblem 2

x + -0.9285714285 = -1.605157504 Simplifying x + -0.9285714285 = -1.605157504 Reorder the terms: -0.9285714285 + x = -1.605157504 Solving -0.9285714285 + x = -1.605157504 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9285714285' to each side of the equation. -0.9285714285 + 0.9285714285 + x = -1.605157504 + 0.9285714285 Combine like terms: -0.9285714285 + 0.9285714285 = 0.0000000000 0.0000000000 + x = -1.605157504 + 0.9285714285 x = -1.605157504 + 0.9285714285 Combine like terms: -1.605157504 + 0.9285714285 = -0.6765860755 x = -0.6765860755 Simplifying x = -0.6765860755

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.5337289325, -0.6765860755}

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