2x^2-x=160

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Solution for 2x^2-x=160 equation:


Simplifying
2x2 + -1x = 160

Reorder the terms:
-1x + 2x2 = 160

Solving
-1x + 2x2 = 160

Solving for variable 'x'.

Reorder the terms:
-160 + -1x + 2x2 = 160 + -160

Combine like terms: 160 + -160 = 0
-160 + -1x + 2x2 = 0

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

Divide each side by '2'.
-80 + -0.5x + x2 = 0

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + -0.5x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + -0.5x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + -0.5x + x2 = 0 + 80
-0.5x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
-0.5x + x2 = 80

The x term is -0.5x.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x + 0.0625 + x2 = 80 + 0.0625

Reorder the terms:
0.0625 + -0.5x + x2 = 80 + 0.0625

Combine like terms: 80 + 0.0625 = 80.0625
0.0625 + -0.5x + x2 = 80.0625

Factor a perfect square on the left side:
(x + -0.25)(x + -0.25) = 80.0625

Calculate the square root of the right side: 8.947765084

Break this problem into two subproblems by setting 
(x + -0.25) equal to 8.947765084 and -8.947765084.

Subproblem 1

x + -0.25 = 8.947765084 Simplifying x + -0.25 = 8.947765084 Reorder the terms: -0.25 + x = 8.947765084 Solving -0.25 + x = 8.947765084 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = 8.947765084 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = 8.947765084 + 0.25 x = 8.947765084 + 0.25 Combine like terms: 8.947765084 + 0.25 = 9.197765084 x = 9.197765084 Simplifying x = 9.197765084

Subproblem 2

x + -0.25 = -8.947765084 Simplifying x + -0.25 = -8.947765084 Reorder the terms: -0.25 + x = -8.947765084 Solving -0.25 + x = -8.947765084 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x = -8.947765084 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x = -8.947765084 + 0.25 x = -8.947765084 + 0.25 Combine like terms: -8.947765084 + 0.25 = -8.697765084 x = -8.697765084 Simplifying x = -8.697765084

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.197765084, -8.697765084}

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