x(x+5)=380

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Solution for x(x+5)=380 equation:


Simplifying
x(x + 5) = 380

Reorder the terms:
x(5 + x) = 380
(5 * x + x * x) = 380
(5x + x2) = 380

Solving
5x + x2 = 380

Solving for variable 'x'.

Reorder the terms:
-380 + 5x + x2 = 380 + -380

Combine like terms: 380 + -380 = 0
-380 + 5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '380' to each side of the equation.
-380 + 5x + 380 + x2 = 0 + 380

Reorder the terms:
-380 + 380 + 5x + x2 = 0 + 380

Combine like terms: -380 + 380 = 0
0 + 5x + x2 = 0 + 380
5x + x2 = 0 + 380

Combine like terms: 0 + 380 = 380
5x + x2 = 380

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 = 380 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 380 + 6.25

Combine like terms: 380 + 6.25 = 386.25
6.25 + 5x + x2 = 386.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 386.25

Calculate the square root of the right side: 19.653244007

Break this problem into two subproblems by setting 
(x + 2.5) equal to 19.653244007 and -19.653244007.

Subproblem 1

x + 2.5 = 19.653244007 Simplifying x + 2.5 = 19.653244007 Reorder the terms: 2.5 + x = 19.653244007 Solving 2.5 + x = 19.653244007 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 = 19.653244007 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 19.653244007 + -2.5 x = 19.653244007 + -2.5 Combine like terms: 19.653244007 + -2.5 = 17.153244007 x = 17.153244007 Simplifying x = 17.153244007

Subproblem 2

x + 2.5 = -19.653244007 Simplifying x + 2.5 = -19.653244007 Reorder the terms: 2.5 + x = -19.653244007 Solving 2.5 + x = -19.653244007 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 = -19.653244007 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -19.653244007 + -2.5 x = -19.653244007 + -2.5 Combine like terms: -19.653244007 + -2.5 = -22.153244007 x = -22.153244007 Simplifying x = -22.153244007

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.153244007, -22.153244007}

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