5x+4x^2-57=0

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Solution for 5x+4x^2-57=0 equation:


Simplifying
5x + 4x2 + -57 = 0

Reorder the terms:
-57 + 5x + 4x2 = 0

Solving
-57 + 5x + 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'.
-14.25 + 1.25x + x2 = 0

Move the constant term to the right:

Add '14.25' to each side of the equation.
-14.25 + 1.25x + 14.25 + x2 = 0 + 14.25

Reorder the terms:
-14.25 + 14.25 + 1.25x + x2 = 0 + 14.25

Combine like terms: -14.25 + 14.25 = 0.00
0.00 + 1.25x + x2 = 0 + 14.25
1.25x + x2 = 0 + 14.25

Combine like terms: 0 + 14.25 = 14.25
1.25x + x2 = 14.25

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 = 14.25 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 14.25 + 0.390625

Combine like terms: 14.25 + 0.390625 = 14.640625
0.390625 + 1.25x + x2 = 14.640625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 14.640625

Calculate the square root of the right side: 3.826306966

Break this problem into two subproblems by setting 
(x + 0.625) equal to 3.826306966 and -3.826306966.

Subproblem 1

x + 0.625 = 3.826306966 Simplifying x + 0.625 = 3.826306966 Reorder the terms: 0.625 + x = 3.826306966 Solving 0.625 + x = 3.826306966 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 = 3.826306966 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 3.826306966 + -0.625 x = 3.826306966 + -0.625 Combine like terms: 3.826306966 + -0.625 = 3.201306966 x = 3.201306966 Simplifying x = 3.201306966

Subproblem 2

x + 0.625 = -3.826306966 Simplifying x + 0.625 = -3.826306966 Reorder the terms: 0.625 + x = -3.826306966 Solving 0.625 + x = -3.826306966 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 = -3.826306966 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -3.826306966 + -0.625 x = -3.826306966 + -0.625 Combine like terms: -3.826306966 + -0.625 = -4.451306966 x = -4.451306966 Simplifying x = -4.451306966

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.201306966, -4.451306966}

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