u^2-3u-2=0

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Solution for u^2-3u-2=0 equation:


Simplifying
u2 + -3u + -2 = 0

Reorder the terms:
-2 + -3u + u2 = 0

Solving
-2 + -3u + u2 = 0

Solving for variable 'u'.

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -3u + 2 + u2 = 0 + 2

Reorder the terms:
-2 + 2 + -3u + u2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -3u + u2 = 0 + 2
-3u + u2 = 0 + 2

Combine like terms: 0 + 2 = 2
-3u + u2 = 2

The u term is -3u.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3u + 2.25 + u2 = 2 + 2.25

Reorder the terms:
2.25 + -3u + u2 = 2 + 2.25

Combine like terms: 2 + 2.25 = 4.25
2.25 + -3u + u2 = 4.25

Factor a perfect square on the left side:
(u + -1.5)(u + -1.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(u + -1.5) equal to 2.061552813 and -2.061552813.

Subproblem 1

u + -1.5 = 2.061552813 Simplifying u + -1.5 = 2.061552813 Reorder the terms: -1.5 + u = 2.061552813 Solving -1.5 + u = 2.061552813 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + u = 2.061552813 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + u = 2.061552813 + 1.5 u = 2.061552813 + 1.5 Combine like terms: 2.061552813 + 1.5 = 3.561552813 u = 3.561552813 Simplifying u = 3.561552813

Subproblem 2

u + -1.5 = -2.061552813 Simplifying u + -1.5 = -2.061552813 Reorder the terms: -1.5 + u = -2.061552813 Solving -1.5 + u = -2.061552813 Solving for variable 'u'. Move all terms containing u to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + u = -2.061552813 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + u = -2.061552813 + 1.5 u = -2.061552813 + 1.5 Combine like terms: -2.061552813 + 1.5 = -0.561552813 u = -0.561552813 Simplifying u = -0.561552813

Solution

The solution to the problem is based on the solutions from the subproblems. u = {3.561552813, -0.561552813}

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