x^2+5x-1600=0

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Solution for x^2+5x-1600=0 equation:


Simplifying
x2 + 5x + -1600 = 0

Reorder the terms:
-1600 + 5x + x2 = 0

Solving
-1600 + 5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '1600' to each side of the equation.
-1600 + 5x + 1600 + x2 = 0 + 1600

Reorder the terms:
-1600 + 1600 + 5x + x2 = 0 + 1600

Combine like terms: -1600 + 1600 = 0
0 + 5x + x2 = 0 + 1600
5x + x2 = 0 + 1600

Combine like terms: 0 + 1600 = 1600
5x + x2 = 1600

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 = 1600 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 1600 + 6.25

Combine like terms: 1600 + 6.25 = 1606.25
6.25 + 5x + x2 = 1606.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 1606.25

Calculate the square root of the right side: 40.078048855

Break this problem into two subproblems by setting 
(x + 2.5) equal to 40.078048855 and -40.078048855.

Subproblem 1

x + 2.5 = 40.078048855 Simplifying x + 2.5 = 40.078048855 Reorder the terms: 2.5 + x = 40.078048855 Solving 2.5 + x = 40.078048855 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 = 40.078048855 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 40.078048855 + -2.5 x = 40.078048855 + -2.5 Combine like terms: 40.078048855 + -2.5 = 37.578048855 x = 37.578048855 Simplifying x = 37.578048855

Subproblem 2

x + 2.5 = -40.078048855 Simplifying x + 2.5 = -40.078048855 Reorder the terms: 2.5 + x = -40.078048855 Solving 2.5 + x = -40.078048855 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 = -40.078048855 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -40.078048855 + -2.5 x = -40.078048855 + -2.5 Combine like terms: -40.078048855 + -2.5 = -42.578048855 x = -42.578048855 Simplifying x = -42.578048855

Solution

The solution to the problem is based on the solutions from the subproblems. x = {37.578048855, -42.578048855}

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