4x^2+56x+99=0

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Solution for 4x^2+56x+99=0 equation:


Simplifying
4x2 + 56x + 99 = 0

Reorder the terms:
99 + 56x + 4x2 = 0

Solving
99 + 56x + 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'.
24.75 + 14x + x2 = 0

Move the constant term to the right:

Add '-24.75' to each side of the equation.
24.75 + 14x + -24.75 + x2 = 0 + -24.75

Reorder the terms:
24.75 + -24.75 + 14x + x2 = 0 + -24.75

Combine like terms: 24.75 + -24.75 = 0.00
0.00 + 14x + x2 = 0 + -24.75
14x + x2 = 0 + -24.75

Combine like terms: 0 + -24.75 = -24.75
14x + x2 = -24.75

The x term is 14x.  Take half its coefficient (7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
14x + 49 + x2 = -24.75 + 49

Reorder the terms:
49 + 14x + x2 = -24.75 + 49

Combine like terms: -24.75 + 49 = 24.25
49 + 14x + x2 = 24.25

Factor a perfect square on the left side:
(x + 7)(x + 7) = 24.25

Calculate the square root of the right side: 4.924428901

Break this problem into two subproblems by setting 
(x + 7) equal to 4.924428901 and -4.924428901.

Subproblem 1

x + 7 = 4.924428901 Simplifying x + 7 = 4.924428901 Reorder the terms: 7 + x = 4.924428901 Solving 7 + x = 4.924428901 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = 4.924428901 + -7 Combine like terms: 7 + -7 = 0 0 + x = 4.924428901 + -7 x = 4.924428901 + -7 Combine like terms: 4.924428901 + -7 = -2.075571099 x = -2.075571099 Simplifying x = -2.075571099

Subproblem 2

x + 7 = -4.924428901 Simplifying x + 7 = -4.924428901 Reorder the terms: 7 + x = -4.924428901 Solving 7 + x = -4.924428901 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7' to each side of the equation. 7 + -7 + x = -4.924428901 + -7 Combine like terms: 7 + -7 = 0 0 + x = -4.924428901 + -7 x = -4.924428901 + -7 Combine like terms: -4.924428901 + -7 = -11.924428901 x = -11.924428901 Simplifying x = -11.924428901

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.075571099, -11.924428901}

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