4x^2+45x+100=0

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Solution for 4x^2+45x+100=0 equation:


Simplifying
4x2 + 45x + 100 = 0

Reorder the terms:
100 + 45x + 4x2 = 0

Solving
100 + 45x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
25 + 11.25x + x2 = 0

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + 11.25x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + 11.25x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + 11.25x + x2 = 0 + -25
11.25x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
11.25x + x2 = -25

The x term is 11.25x.  Take half its coefficient (5.625).
Square it (31.640625) and add it to both sides.

Add '31.640625' to each side of the equation.
11.25x + 31.640625 + x2 = -25 + 31.640625

Reorder the terms:
31.640625 + 11.25x + x2 = -25 + 31.640625

Combine like terms: -25 + 31.640625 = 6.640625
31.640625 + 11.25x + x2 = 6.640625

Factor a perfect square on the left side:
(x + 5.625)(x + 5.625) = 6.640625

Calculate the square root of the right side: 2.576941016

Break this problem into two subproblems by setting 
(x + 5.625) equal to 2.576941016 and -2.576941016.

Subproblem 1

x + 5.625 = 2.576941016 Simplifying x + 5.625 = 2.576941016 Reorder the terms: 5.625 + x = 2.576941016 Solving 5.625 + x = 2.576941016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.625' to each side of the equation. 5.625 + -5.625 + x = 2.576941016 + -5.625 Combine like terms: 5.625 + -5.625 = 0.000 0.000 + x = 2.576941016 + -5.625 x = 2.576941016 + -5.625 Combine like terms: 2.576941016 + -5.625 = -3.048058984 x = -3.048058984 Simplifying x = -3.048058984

Subproblem 2

x + 5.625 = -2.576941016 Simplifying x + 5.625 = -2.576941016 Reorder the terms: 5.625 + x = -2.576941016 Solving 5.625 + x = -2.576941016 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5.625' to each side of the equation. 5.625 + -5.625 + x = -2.576941016 + -5.625 Combine like terms: 5.625 + -5.625 = 0.000 0.000 + x = -2.576941016 + -5.625 x = -2.576941016 + -5.625 Combine like terms: -2.576941016 + -5.625 = -8.201941016 x = -8.201941016 Simplifying x = -8.201941016

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.048058984, -8.201941016}

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