0.5x^2+2x-160=0

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Solution for 0.5x^2+2x-160=0 equation:


Simplifying
0.5x2 + 2x + -160 = 0

Reorder the terms:
-160 + 2x + 0.5x2 = 0

Solving
-160 + 2x + 0.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.5'.
-320 + 4x + x2 = 0

Move the constant term to the right:

Add '320' to each side of the equation.
-320 + 4x + 320 + x2 = 0 + 320

Reorder the terms:
-320 + 320 + 4x + x2 = 0 + 320

Combine like terms: -320 + 320 = 0
0 + 4x + x2 = 0 + 320
4x + x2 = 0 + 320

Combine like terms: 0 + 320 = 320
4x + x2 = 320

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 320 + 4

Reorder the terms:
4 + 4x + x2 = 320 + 4

Combine like terms: 320 + 4 = 324
4 + 4x + x2 = 324

Factor a perfect square on the left side:
(x + 2)(x + 2) = 324

Calculate the square root of the right side: 18

Break this problem into two subproblems by setting 
(x + 2) equal to 18 and -18.

Subproblem 1

x + 2 = 18 Simplifying x + 2 = 18 Reorder the terms: 2 + x = 18 Solving 2 + x = 18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 18 + -2 Combine like terms: 2 + -2 = 0 0 + x = 18 + -2 x = 18 + -2 Combine like terms: 18 + -2 = 16 x = 16 Simplifying x = 16

Subproblem 2

x + 2 = -18 Simplifying x + 2 = -18 Reorder the terms: 2 + x = -18 Solving 2 + x = -18 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -18 + -2 Combine like terms: 2 + -2 = 0 0 + x = -18 + -2 x = -18 + -2 Combine like terms: -18 + -2 = -20 x = -20 Simplifying x = -20

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16, -20}

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