7x^2-54x-6=0

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Solution for 7x^2-54x-6=0 equation:


Simplifying
7x2 + -54x + -6 = 0

Reorder the terms:
-6 + -54x + 7x2 = 0

Solving
-6 + -54x + 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'.
-0.8571428571 + -7.714285714x + x2 = 0

Move the constant term to the right:

Add '0.8571428571' to each side of the equation.
-0.8571428571 + -7.714285714x + 0.8571428571 + x2 = 0 + 0.8571428571

Reorder the terms:
-0.8571428571 + 0.8571428571 + -7.714285714x + x2 = 0 + 0.8571428571

Combine like terms: -0.8571428571 + 0.8571428571 = 0.0000000000
0.0000000000 + -7.714285714x + x2 = 0 + 0.8571428571
-7.714285714x + x2 = 0 + 0.8571428571

Combine like terms: 0 + 0.8571428571 = 0.8571428571
-7.714285714x + x2 = 0.8571428571

The x term is -7.714285714x.  Take half its coefficient (-3.857142857).
Square it (14.87755102) and add it to both sides.

Add '14.87755102' to each side of the equation.
-7.714285714x + 14.87755102 + x2 = 0.8571428571 + 14.87755102

Reorder the terms:
14.87755102 + -7.714285714x + x2 = 0.8571428571 + 14.87755102

Combine like terms: 0.8571428571 + 14.87755102 = 15.7346938771
14.87755102 + -7.714285714x + x2 = 15.7346938771

Factor a perfect square on the left side:
(x + -3.857142857)(x + -3.857142857) = 15.7346938771

Calculate the square root of the right side: 3.966698108

Break this problem into two subproblems by setting 
(x + -3.857142857) equal to 3.966698108 and -3.966698108.

Subproblem 1

x + -3.857142857 = 3.966698108 Simplifying x + -3.857142857 = 3.966698108 Reorder the terms: -3.857142857 + x = 3.966698108 Solving -3.857142857 + x = 3.966698108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.857142857' to each side of the equation. -3.857142857 + 3.857142857 + x = 3.966698108 + 3.857142857 Combine like terms: -3.857142857 + 3.857142857 = 0.000000000 0.000000000 + x = 3.966698108 + 3.857142857 x = 3.966698108 + 3.857142857 Combine like terms: 3.966698108 + 3.857142857 = 7.823840965 x = 7.823840965 Simplifying x = 7.823840965

Subproblem 2

x + -3.857142857 = -3.966698108 Simplifying x + -3.857142857 = -3.966698108 Reorder the terms: -3.857142857 + x = -3.966698108 Solving -3.857142857 + x = -3.966698108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.857142857' to each side of the equation. -3.857142857 + 3.857142857 + x = -3.966698108 + 3.857142857 Combine like terms: -3.857142857 + 3.857142857 = 0.000000000 0.000000000 + x = -3.966698108 + 3.857142857 x = -3.966698108 + 3.857142857 Combine like terms: -3.966698108 + 3.857142857 = -0.109555251 x = -0.109555251 Simplifying x = -0.109555251

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.823840965, -0.109555251}

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