4x^2+5x=504

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Solution for 4x^2+5x=504 equation:


Simplifying
4x2 + 5x = 504

Reorder the terms:
5x + 4x2 = 504

Solving
5x + 4x2 = 504

Solving for variable 'x'.

Reorder the terms:
-504 + 5x + 4x2 = 504 + -504

Combine like terms: 504 + -504 = 0
-504 + 5x + 4x2 = 0

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

Divide each side by '4'.
-126 + 1.25x + x2 = 0

Move the constant term to the right:

Add '126' to each side of the equation.
-126 + 1.25x + 126 + x2 = 0 + 126

Reorder the terms:
-126 + 126 + 1.25x + x2 = 0 + 126

Combine like terms: -126 + 126 = 0
0 + 1.25x + x2 = 0 + 126
1.25x + x2 = 0 + 126

Combine like terms: 0 + 126 = 126
1.25x + x2 = 126

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 126 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 126 + 0.390625

Combine like terms: 126 + 0.390625 = 126.390625
0.390625 + 1.25x + x2 = 126.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 126.390625

Calculate the square root of the right side: 11.242358516

Break this problem into two subproblems by setting 
(x + 0.625) equal to 11.242358516 and -11.242358516.

Subproblem 1

x + 0.625 = 11.242358516 Simplifying x + 0.625 = 11.242358516 Reorder the terms: 0.625 + x = 11.242358516 Solving 0.625 + x = 11.242358516 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 11.242358516 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 11.242358516 + -0.625 x = 11.242358516 + -0.625 Combine like terms: 11.242358516 + -0.625 = 10.617358516 x = 10.617358516 Simplifying x = 10.617358516

Subproblem 2

x + 0.625 = -11.242358516 Simplifying x + 0.625 = -11.242358516 Reorder the terms: 0.625 + x = -11.242358516 Solving 0.625 + x = -11.242358516 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -11.242358516 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -11.242358516 + -0.625 x = -11.242358516 + -0.625 Combine like terms: -11.242358516 + -0.625 = -11.867358516 x = -11.867358516 Simplifying x = -11.867358516

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.617358516, -11.867358516}

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