x^2+5x=403

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Solution for x^2+5x=403 equation:


Simplifying
x2 + 5x = 403

Reorder the terms:
5x + x2 = 403

Solving
5x + x2 = 403

Solving for variable 'x'.

Reorder the terms:
-403 + 5x + x2 = 403 + -403

Combine like terms: 403 + -403 = 0
-403 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '403' to each side of the equation.
-403 + 5x + 403 + x2 = 0 + 403

Reorder the terms:
-403 + 403 + 5x + x2 = 0 + 403

Combine like terms: -403 + 403 = 0
0 + 5x + x2 = 0 + 403
5x + x2 = 0 + 403

Combine like terms: 0 + 403 = 403
5x + x2 = 403

The x term is 5x.  Take half its coefficient (2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
5x + 6.25 + x2 = 403 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 403 + 6.25

Combine like terms: 403 + 6.25 = 409.25
6.25 + 5x + x2 = 409.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 409.25

Calculate the square root of the right side: 20.229928324

Break this problem into two subproblems by setting 
(x + 2.5) equal to 20.229928324 and -20.229928324.

Subproblem 1

x + 2.5 = 20.229928324 Simplifying x + 2.5 = 20.229928324 Reorder the terms: 2.5 + x = 20.229928324 Solving 2.5 + x = 20.229928324 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = 20.229928324 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 20.229928324 + -2.5 x = 20.229928324 + -2.5 Combine like terms: 20.229928324 + -2.5 = 17.729928324 x = 17.729928324 Simplifying x = 17.729928324

Subproblem 2

x + 2.5 = -20.229928324 Simplifying x + 2.5 = -20.229928324 Reorder the terms: 2.5 + x = -20.229928324 Solving 2.5 + x = -20.229928324 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.5' to each side of the equation. 2.5 + -2.5 + x = -20.229928324 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -20.229928324 + -2.5 x = -20.229928324 + -2.5 Combine like terms: -20.229928324 + -2.5 = -22.729928324 x = -22.729928324 Simplifying x = -22.729928324

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.729928324, -22.729928324}

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