x^2+5x-320=0

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Solution for x^2+5x-320=0 equation:


Simplifying
x2 + 5x + -320 = 0

Reorder the terms:
-320 + 5x + x2 = 0

Solving
-320 + 5x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '320' to each side of the equation.
-320 + 5x + 320 + x2 = 0 + 320

Reorder the terms:
-320 + 320 + 5x + x2 = 0 + 320

Combine like terms: -320 + 320 = 0
0 + 5x + x2 = 0 + 320
5x + x2 = 0 + 320

Combine like terms: 0 + 320 = 320
5x + x2 = 320

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 = 320 + 6.25

Reorder the terms:
6.25 + 5x + x2 = 320 + 6.25

Combine like terms: 320 + 6.25 = 326.25
6.25 + 5x + x2 = 326.25

Factor a perfect square on the left side:
(x + 2.5)(x + 2.5) = 326.25

Calculate the square root of the right side: 18.062391868

Break this problem into two subproblems by setting 
(x + 2.5) equal to 18.062391868 and -18.062391868.

Subproblem 1

x + 2.5 = 18.062391868 Simplifying x + 2.5 = 18.062391868 Reorder the terms: 2.5 + x = 18.062391868 Solving 2.5 + x = 18.062391868 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 = 18.062391868 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = 18.062391868 + -2.5 x = 18.062391868 + -2.5 Combine like terms: 18.062391868 + -2.5 = 15.562391868 x = 15.562391868 Simplifying x = 15.562391868

Subproblem 2

x + 2.5 = -18.062391868 Simplifying x + 2.5 = -18.062391868 Reorder the terms: 2.5 + x = -18.062391868 Solving 2.5 + x = -18.062391868 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 = -18.062391868 + -2.5 Combine like terms: 2.5 + -2.5 = 0.0 0.0 + x = -18.062391868 + -2.5 x = -18.062391868 + -2.5 Combine like terms: -18.062391868 + -2.5 = -20.562391868 x = -20.562391868 Simplifying x = -20.562391868

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.562391868, -20.562391868}

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