5x^2+60x+172=0

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Solution for 5x^2+60x+172=0 equation:


Simplifying
5x2 + 60x + 172 = 0

Reorder the terms:
172 + 60x + 5x2 = 0

Solving
172 + 60x + 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'.
34.4 + 12x + x2 = 0

Move the constant term to the right:

Add '-34.4' to each side of the equation.
34.4 + 12x + -34.4 + x2 = 0 + -34.4

Reorder the terms:
34.4 + -34.4 + 12x + x2 = 0 + -34.4

Combine like terms: 34.4 + -34.4 = 0.0
0.0 + 12x + x2 = 0 + -34.4
12x + x2 = 0 + -34.4

Combine like terms: 0 + -34.4 = -34.4
12x + x2 = -34.4

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = -34.4 + 36

Reorder the terms:
36 + 12x + x2 = -34.4 + 36

Combine like terms: -34.4 + 36 = 1.6
36 + 12x + x2 = 1.6

Factor a perfect square on the left side:
(x + 6)(x + 6) = 1.6

Calculate the square root of the right side: 1.264911064

Break this problem into two subproblems by setting 
(x + 6) equal to 1.264911064 and -1.264911064.

Subproblem 1

x + 6 = 1.264911064 Simplifying x + 6 = 1.264911064 Reorder the terms: 6 + x = 1.264911064 Solving 6 + x = 1.264911064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 1.264911064 + -6 Combine like terms: 6 + -6 = 0 0 + x = 1.264911064 + -6 x = 1.264911064 + -6 Combine like terms: 1.264911064 + -6 = -4.735088936 x = -4.735088936 Simplifying x = -4.735088936

Subproblem 2

x + 6 = -1.264911064 Simplifying x + 6 = -1.264911064 Reorder the terms: 6 + x = -1.264911064 Solving 6 + x = -1.264911064 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -1.264911064 + -6 Combine like terms: 6 + -6 = 0 0 + x = -1.264911064 + -6 x = -1.264911064 + -6 Combine like terms: -1.264911064 + -6 = -7.264911064 x = -7.264911064 Simplifying x = -7.264911064

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.735088936, -7.264911064}

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