4x^2+5x=360

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Solution for 4x^2+5x=360 equation:


Simplifying
4x2 + 5x = 360

Reorder the terms:
5x + 4x2 = 360

Solving
5x + 4x2 = 360

Solving for variable 'x'.

Reorder the terms:
-360 + 5x + 4x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-360 + 5x + 4x2 = 0

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

Divide each side by '4'.
-90 + 1.25x + x2 = 0

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + 1.25x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + 1.25x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 1.25x + x2 = 0 + 90
1.25x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
1.25x + x2 = 90

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 = 90 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 90 + 0.390625

Combine like terms: 90 + 0.390625 = 90.390625
0.390625 + 1.25x + x2 = 90.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 90.390625

Calculate the square root of the right side: 9.507398435

Break this problem into two subproblems by setting 
(x + 0.625) equal to 9.507398435 and -9.507398435.

Subproblem 1

x + 0.625 = 9.507398435 Simplifying x + 0.625 = 9.507398435 Reorder the terms: 0.625 + x = 9.507398435 Solving 0.625 + x = 9.507398435 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 = 9.507398435 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 9.507398435 + -0.625 x = 9.507398435 + -0.625 Combine like terms: 9.507398435 + -0.625 = 8.882398435 x = 8.882398435 Simplifying x = 8.882398435

Subproblem 2

x + 0.625 = -9.507398435 Simplifying x + 0.625 = -9.507398435 Reorder the terms: 0.625 + x = -9.507398435 Solving 0.625 + x = -9.507398435 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 = -9.507398435 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -9.507398435 + -0.625 x = -9.507398435 + -0.625 Combine like terms: -9.507398435 + -0.625 = -10.132398435 x = -10.132398435 Simplifying x = -10.132398435

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.882398435, -10.132398435}

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