4x^2+34x+47=0

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Solution for 4x^2+34x+47=0 equation:


Simplifying
4x2 + 34x + 47 = 0

Reorder the terms:
47 + 34x + 4x2 = 0

Solving
47 + 34x + 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'.
11.75 + 8.5x + x2 = 0

Move the constant term to the right:

Add '-11.75' to each side of the equation.
11.75 + 8.5x + -11.75 + x2 = 0 + -11.75

Reorder the terms:
11.75 + -11.75 + 8.5x + x2 = 0 + -11.75

Combine like terms: 11.75 + -11.75 = 0.00
0.00 + 8.5x + x2 = 0 + -11.75
8.5x + x2 = 0 + -11.75

Combine like terms: 0 + -11.75 = -11.75
8.5x + x2 = -11.75

The x term is 8.5x.  Take half its coefficient (4.25).
Square it (18.0625) and add it to both sides.

Add '18.0625' to each side of the equation.
8.5x + 18.0625 + x2 = -11.75 + 18.0625

Reorder the terms:
18.0625 + 8.5x + x2 = -11.75 + 18.0625

Combine like terms: -11.75 + 18.0625 = 6.3125
18.0625 + 8.5x + x2 = 6.3125

Factor a perfect square on the left side:
(x + 4.25)(x + 4.25) = 6.3125

Calculate the square root of the right side: 2.512468905

Break this problem into two subproblems by setting 
(x + 4.25) equal to 2.512468905 and -2.512468905.

Subproblem 1

x + 4.25 = 2.512468905 Simplifying x + 4.25 = 2.512468905 Reorder the terms: 4.25 + x = 2.512468905 Solving 4.25 + x = 2.512468905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + x = 2.512468905 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + x = 2.512468905 + -4.25 x = 2.512468905 + -4.25 Combine like terms: 2.512468905 + -4.25 = -1.737531095 x = -1.737531095 Simplifying x = -1.737531095

Subproblem 2

x + 4.25 = -2.512468905 Simplifying x + 4.25 = -2.512468905 Reorder the terms: 4.25 + x = -2.512468905 Solving 4.25 + x = -2.512468905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.25' to each side of the equation. 4.25 + -4.25 + x = -2.512468905 + -4.25 Combine like terms: 4.25 + -4.25 = 0.00 0.00 + x = -2.512468905 + -4.25 x = -2.512468905 + -4.25 Combine like terms: -2.512468905 + -4.25 = -6.762468905 x = -6.762468905 Simplifying x = -6.762468905

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.737531095, -6.762468905}

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