4x^2+9x-47=0

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Solution for 4x^2+9x-47=0 equation:


Simplifying
4x2 + 9x + -47 = 0

Reorder the terms:
-47 + 9x + 4x2 = 0

Solving
-47 + 9x + 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 + 2.25x + x2 = 0

Move the constant term to the right:

Add '11.75' to each side of the equation.
-11.75 + 2.25x + 11.75 + x2 = 0 + 11.75

Reorder the terms:
-11.75 + 11.75 + 2.25x + x2 = 0 + 11.75

Combine like terms: -11.75 + 11.75 = 0.00
0.00 + 2.25x + x2 = 0 + 11.75
2.25x + x2 = 0 + 11.75

Combine like terms: 0 + 11.75 = 11.75
2.25x + x2 = 11.75

The x term is 2.25x.  Take half its coefficient (1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
2.25x + 1.265625 + x2 = 11.75 + 1.265625

Reorder the terms:
1.265625 + 2.25x + x2 = 11.75 + 1.265625

Combine like terms: 11.75 + 1.265625 = 13.015625
1.265625 + 2.25x + x2 = 13.015625

Factor a perfect square on the left side:
(x + 1.125)(x + 1.125) = 13.015625

Calculate the square root of the right side: 3.607717422

Break this problem into two subproblems by setting 
(x + 1.125) equal to 3.607717422 and -3.607717422.

Subproblem 1

x + 1.125 = 3.607717422 Simplifying x + 1.125 = 3.607717422 Reorder the terms: 1.125 + x = 3.607717422 Solving 1.125 + x = 3.607717422 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = 3.607717422 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = 3.607717422 + -1.125 x = 3.607717422 + -1.125 Combine like terms: 3.607717422 + -1.125 = 2.482717422 x = 2.482717422 Simplifying x = 2.482717422

Subproblem 2

x + 1.125 = -3.607717422 Simplifying x + 1.125 = -3.607717422 Reorder the terms: 1.125 + x = -3.607717422 Solving 1.125 + x = -3.607717422 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.125' to each side of the equation. 1.125 + -1.125 + x = -3.607717422 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = -3.607717422 + -1.125 x = -3.607717422 + -1.125 Combine like terms: -3.607717422 + -1.125 = -4.732717422 x = -4.732717422 Simplifying x = -4.732717422

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.482717422, -4.732717422}

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