9x^2+56x+74=0

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Solution for 9x^2+56x+74=0 equation:


Simplifying
9x2 + 56x + 74 = 0

Reorder the terms:
74 + 56x + 9x2 = 0

Solving
74 + 56x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
8.222222222 + 6.222222222x + x2 = 0

Move the constant term to the right:

Add '-8.222222222' to each side of the equation.
8.222222222 + 6.222222222x + -8.222222222 + x2 = 0 + -8.222222222

Reorder the terms:
8.222222222 + -8.222222222 + 6.222222222x + x2 = 0 + -8.222222222

Combine like terms: 8.222222222 + -8.222222222 = 0.000000000
0.000000000 + 6.222222222x + x2 = 0 + -8.222222222
6.222222222x + x2 = 0 + -8.222222222

Combine like terms: 0 + -8.222222222 = -8.222222222
6.222222222x + x2 = -8.222222222

The x term is 6.222222222x.  Take half its coefficient (3.111111111).
Square it (9.679012345) and add it to both sides.

Add '9.679012345' to each side of the equation.
6.222222222x + 9.679012345 + x2 = -8.222222222 + 9.679012345

Reorder the terms:
9.679012345 + 6.222222222x + x2 = -8.222222222 + 9.679012345

Combine like terms: -8.222222222 + 9.679012345 = 1.456790123
9.679012345 + 6.222222222x + x2 = 1.456790123

Factor a perfect square on the left side:
(x + 3.111111111)(x + 3.111111111) = 1.456790123

Calculate the square root of the right side: 1.20697561

Break this problem into two subproblems by setting 
(x + 3.111111111) equal to 1.20697561 and -1.20697561.

Subproblem 1

x + 3.111111111 = 1.20697561 Simplifying x + 3.111111111 = 1.20697561 Reorder the terms: 3.111111111 + x = 1.20697561 Solving 3.111111111 + x = 1.20697561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.111111111' to each side of the equation. 3.111111111 + -3.111111111 + x = 1.20697561 + -3.111111111 Combine like terms: 3.111111111 + -3.111111111 = 0.000000000 0.000000000 + x = 1.20697561 + -3.111111111 x = 1.20697561 + -3.111111111 Combine like terms: 1.20697561 + -3.111111111 = -1.904135501 x = -1.904135501 Simplifying x = -1.904135501

Subproblem 2

x + 3.111111111 = -1.20697561 Simplifying x + 3.111111111 = -1.20697561 Reorder the terms: 3.111111111 + x = -1.20697561 Solving 3.111111111 + x = -1.20697561 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.111111111' to each side of the equation. 3.111111111 + -3.111111111 + x = -1.20697561 + -3.111111111 Combine like terms: 3.111111111 + -3.111111111 = 0.000000000 0.000000000 + x = -1.20697561 + -3.111111111 x = -1.20697561 + -3.111111111 Combine like terms: -1.20697561 + -3.111111111 = -4.318086721 x = -4.318086721 Simplifying x = -4.318086721

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.904135501, -4.318086721}

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