0=7x^2+4x-6

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Solution for 0=7x^2+4x-6 equation:


Simplifying
0 = 7x2 + 4x + -6

Reorder the terms:
0 = -6 + 4x + 7x2

Solving
0 = -6 + 4x + 7x2

Solving for variable 'x'.

Combine like terms: 0 + 6 = 6
6 + -4x + -7x2 = -6 + 4x + 7x2 + 6 + -4x + -7x2

Reorder the terms:
6 + -4x + -7x2 = -6 + 6 + 4x + -4x + 7x2 + -7x2

Combine like terms: -6 + 6 = 0
6 + -4x + -7x2 = 0 + 4x + -4x + 7x2 + -7x2
6 + -4x + -7x2 = 4x + -4x + 7x2 + -7x2

Combine like terms: 4x + -4x = 0
6 + -4x + -7x2 = 0 + 7x2 + -7x2
6 + -4x + -7x2 = 7x2 + -7x2

Combine like terms: 7x2 + -7x2 = 0
6 + -4x + -7x2 = 0

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

Divide each side by '-7'.
-0.8571428571 + 0.5714285714x + x2 = 0

Move the constant term to the right:

Add '0.8571428571' to each side of the equation.
-0.8571428571 + 0.5714285714x + 0.8571428571 + x2 = 0 + 0.8571428571

Reorder the terms:
-0.8571428571 + 0.8571428571 + 0.5714285714x + x2 = 0 + 0.8571428571

Combine like terms: -0.8571428571 + 0.8571428571 = 0.0000000000
0.0000000000 + 0.5714285714x + x2 = 0 + 0.8571428571
0.5714285714x + x2 = 0 + 0.8571428571

Combine like terms: 0 + 0.8571428571 = 0.8571428571
0.5714285714x + x2 = 0.8571428571

The x term is 0.5714285714x.  Take half its coefficient (0.2857142857).
Square it (0.08163265305) and add it to both sides.

Add '0.08163265305' to each side of the equation.
0.5714285714x + 0.08163265305 + x2 = 0.8571428571 + 0.08163265305

Reorder the terms:
0.08163265305 + 0.5714285714x + x2 = 0.8571428571 + 0.08163265305

Combine like terms: 0.8571428571 + 0.08163265305 = 0.93877551015
0.08163265305 + 0.5714285714x + x2 = 0.93877551015

Factor a perfect square on the left side:
(x + 0.2857142857)(x + 0.2857142857) = 0.93877551015

Calculate the square root of the right side: 0.968904283

Break this problem into two subproblems by setting 
(x + 0.2857142857) equal to 0.968904283 and -0.968904283.

Subproblem 1

x + 0.2857142857 = 0.968904283 Simplifying x + 0.2857142857 = 0.968904283 Reorder the terms: 0.2857142857 + x = 0.968904283 Solving 0.2857142857 + x = 0.968904283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2857142857' to each side of the equation. 0.2857142857 + -0.2857142857 + x = 0.968904283 + -0.2857142857 Combine like terms: 0.2857142857 + -0.2857142857 = 0.0000000000 0.0000000000 + x = 0.968904283 + -0.2857142857 x = 0.968904283 + -0.2857142857 Combine like terms: 0.968904283 + -0.2857142857 = 0.6831899973 x = 0.6831899973 Simplifying x = 0.6831899973

Subproblem 2

x + 0.2857142857 = -0.968904283 Simplifying x + 0.2857142857 = -0.968904283 Reorder the terms: 0.2857142857 + x = -0.968904283 Solving 0.2857142857 + x = -0.968904283 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.2857142857' to each side of the equation. 0.2857142857 + -0.2857142857 + x = -0.968904283 + -0.2857142857 Combine like terms: 0.2857142857 + -0.2857142857 = 0.0000000000 0.0000000000 + x = -0.968904283 + -0.2857142857 x = -0.968904283 + -0.2857142857 Combine like terms: -0.968904283 + -0.2857142857 = -1.2546185687 x = -1.2546185687 Simplifying x = -1.2546185687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6831899973, -1.2546185687}

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