5x^2+75x+1=0

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Solution for 5x^2+75x+1=0 equation:


Simplifying
5x2 + 75x + 1 = 0

Reorder the terms:
1 + 75x + 5x2 = 0

Solving
1 + 75x + 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'.
0.2 + 15x + x2 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + 15x + -0.2 + x2 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + 15x + x2 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + 15x + x2 = 0 + -0.2
15x + x2 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
15x + x2 = -0.2

The x term is 15x.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15x + 56.25 + x2 = -0.2 + 56.25

Reorder the terms:
56.25 + 15x + x2 = -0.2 + 56.25

Combine like terms: -0.2 + 56.25 = 56.05
56.25 + 15x + x2 = 56.05

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 56.05

Calculate the square root of the right side: 7.486654794

Break this problem into two subproblems by setting 
(x + 7.5) equal to 7.486654794 and -7.486654794.

Subproblem 1

x + 7.5 = 7.486654794 Simplifying x + 7.5 = 7.486654794 Reorder the terms: 7.5 + x = 7.486654794 Solving 7.5 + x = 7.486654794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = 7.486654794 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 7.486654794 + -7.5 x = 7.486654794 + -7.5 Combine like terms: 7.486654794 + -7.5 = -0.013345206 x = -0.013345206 Simplifying x = -0.013345206

Subproblem 2

x + 7.5 = -7.486654794 Simplifying x + 7.5 = -7.486654794 Reorder the terms: 7.5 + x = -7.486654794 Solving 7.5 + x = -7.486654794 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = -7.486654794 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -7.486654794 + -7.5 x = -7.486654794 + -7.5 Combine like terms: -7.486654794 + -7.5 = -14.986654794 x = -14.986654794 Simplifying x = -14.986654794

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.013345206, -14.986654794}

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