7x^2-42x-60=0

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Solution for 7x^2-42x-60=0 equation:


Simplifying
7x2 + -42x + -60 = 0

Reorder the terms:
-60 + -42x + 7x2 = 0

Solving
-60 + -42x + 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'.
-8.571428571 + -6x + x2 = 0

Move the constant term to the right:

Add '8.571428571' to each side of the equation.
-8.571428571 + -6x + 8.571428571 + x2 = 0 + 8.571428571

Reorder the terms:
-8.571428571 + 8.571428571 + -6x + x2 = 0 + 8.571428571

Combine like terms: -8.571428571 + 8.571428571 = 0.000000000
0.000000000 + -6x + x2 = 0 + 8.571428571
-6x + x2 = 0 + 8.571428571

Combine like terms: 0 + 8.571428571 = 8.571428571
-6x + x2 = 8.571428571

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = 8.571428571 + 9

Reorder the terms:
9 + -6x + x2 = 8.571428571 + 9

Combine like terms: 8.571428571 + 9 = 17.571428571
9 + -6x + x2 = 17.571428571

Factor a perfect square on the left side:
(x + -3)(x + -3) = 17.571428571

Calculate the square root of the right side: 4.191828786

Break this problem into two subproblems by setting 
(x + -3) equal to 4.191828786 and -4.191828786.

Subproblem 1

x + -3 = 4.191828786 Simplifying x + -3 = 4.191828786 Reorder the terms: -3 + x = 4.191828786 Solving -3 + x = 4.191828786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 4.191828786 + 3 Combine like terms: -3 + 3 = 0 0 + x = 4.191828786 + 3 x = 4.191828786 + 3 Combine like terms: 4.191828786 + 3 = 7.191828786 x = 7.191828786 Simplifying x = 7.191828786

Subproblem 2

x + -3 = -4.191828786 Simplifying x + -3 = -4.191828786 Reorder the terms: -3 + x = -4.191828786 Solving -3 + x = -4.191828786 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -4.191828786 + 3 Combine like terms: -3 + 3 = 0 0 + x = -4.191828786 + 3 x = -4.191828786 + 3 Combine like terms: -4.191828786 + 3 = -1.191828786 x = -1.191828786 Simplifying x = -1.191828786

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.191828786, -1.191828786}

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