4x^2+9x-520=0

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Solution for 4x^2+9x-520=0 equation:


Simplifying
4x2 + 9x + -520 = 0

Reorder the terms:
-520 + 9x + 4x2 = 0

Solving
-520 + 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'.
-130 + 2.25x + x2 = 0

Move the constant term to the right:

Add '130' to each side of the equation.
-130 + 2.25x + 130 + x2 = 0 + 130

Reorder the terms:
-130 + 130 + 2.25x + x2 = 0 + 130

Combine like terms: -130 + 130 = 0
0 + 2.25x + x2 = 0 + 130
2.25x + x2 = 0 + 130

Combine like terms: 0 + 130 = 130
2.25x + x2 = 130

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 = 130 + 1.265625

Reorder the terms:
1.265625 + 2.25x + x2 = 130 + 1.265625

Combine like terms: 130 + 1.265625 = 131.265625
1.265625 + 2.25x + x2 = 131.265625

Factor a perfect square on the left side:
(x + 1.125)(x + 1.125) = 131.265625

Calculate the square root of the right side: 11.457121148

Break this problem into two subproblems by setting 
(x + 1.125) equal to 11.457121148 and -11.457121148.

Subproblem 1

x + 1.125 = 11.457121148 Simplifying x + 1.125 = 11.457121148 Reorder the terms: 1.125 + x = 11.457121148 Solving 1.125 + x = 11.457121148 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 = 11.457121148 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = 11.457121148 + -1.125 x = 11.457121148 + -1.125 Combine like terms: 11.457121148 + -1.125 = 10.332121148 x = 10.332121148 Simplifying x = 10.332121148

Subproblem 2

x + 1.125 = -11.457121148 Simplifying x + 1.125 = -11.457121148 Reorder the terms: 1.125 + x = -11.457121148 Solving 1.125 + x = -11.457121148 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 = -11.457121148 + -1.125 Combine like terms: 1.125 + -1.125 = 0.000 0.000 + x = -11.457121148 + -1.125 x = -11.457121148 + -1.125 Combine like terms: -11.457121148 + -1.125 = -12.582121148 x = -12.582121148 Simplifying x = -12.582121148

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.332121148, -12.582121148}

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