4x^2+5x=440

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Solution for 4x^2+5x=440 equation:


Simplifying
4x2 + 5x = 440

Reorder the terms:
5x + 4x2 = 440

Solving
5x + 4x2 = 440

Solving for variable 'x'.

Reorder the terms:
-440 + 5x + 4x2 = 440 + -440

Combine like terms: 440 + -440 = 0
-440 + 5x + 4x2 = 0

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

Divide each side by '4'.
-110 + 1.25x + x2 = 0

Move the constant term to the right:

Add '110' to each side of the equation.
-110 + 1.25x + 110 + x2 = 0 + 110

Reorder the terms:
-110 + 110 + 1.25x + x2 = 0 + 110

Combine like terms: -110 + 110 = 0
0 + 1.25x + x2 = 0 + 110
1.25x + x2 = 0 + 110

Combine like terms: 0 + 110 = 110
1.25x + x2 = 110

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 = 110 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 110 + 0.390625

Combine like terms: 110 + 0.390625 = 110.390625
0.390625 + 1.25x + x2 = 110.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 110.390625

Calculate the square root of the right side: 10.506694295

Break this problem into two subproblems by setting 
(x + 0.625) equal to 10.506694295 and -10.506694295.

Subproblem 1

x + 0.625 = 10.506694295 Simplifying x + 0.625 = 10.506694295 Reorder the terms: 0.625 + x = 10.506694295 Solving 0.625 + x = 10.506694295 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 = 10.506694295 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 10.506694295 + -0.625 x = 10.506694295 + -0.625 Combine like terms: 10.506694295 + -0.625 = 9.881694295 x = 9.881694295 Simplifying x = 9.881694295

Subproblem 2

x + 0.625 = -10.506694295 Simplifying x + 0.625 = -10.506694295 Reorder the terms: 0.625 + x = -10.506694295 Solving 0.625 + x = -10.506694295 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 = -10.506694295 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -10.506694295 + -0.625 x = -10.506694295 + -0.625 Combine like terms: -10.506694295 + -0.625 = -11.131694295 x = -11.131694295 Simplifying x = -11.131694295

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.881694295, -11.131694295}

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