(u+3)(u)=65

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Solution for (u+3)(u)=65 equation:


Simplifying
(u + 3)(u) = 65

Reorder the terms:
(3 + u)(u) = 65

Reorder the terms for easier multiplication:
u(3 + u) = 65
(3 * u + u * u) = 65
(3u + u2) = 65

Solving
3u + u2 = 65

Solving for variable 'u'.

Reorder the terms:
-65 + 3u + u2 = 65 + -65

Combine like terms: 65 + -65 = 0
-65 + 3u + u2 = 0

Begin completing the square.

Move the constant term to the right:

Add '65' to each side of the equation.
-65 + 3u + 65 + u2 = 0 + 65

Reorder the terms:
-65 + 65 + 3u + u2 = 0 + 65

Combine like terms: -65 + 65 = 0
0 + 3u + u2 = 0 + 65
3u + u2 = 0 + 65

Combine like terms: 0 + 65 = 65
3u + u2 = 65

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 = 65 + 2.25

Reorder the terms:
2.25 + 3u + u2 = 65 + 2.25

Combine like terms: 65 + 2.25 = 67.25
2.25 + 3u + u2 = 67.25

Factor a perfect square on the left side:
(u + 1.5)(u + 1.5) = 67.25

Calculate the square root of the right side: 8.200609733

Break this problem into two subproblems by setting 
(u + 1.5) equal to 8.200609733 and -8.200609733.

Subproblem 1

u + 1.5 = 8.200609733 Simplifying u + 1.5 = 8.200609733 Reorder the terms: 1.5 + u = 8.200609733 Solving 1.5 + u = 8.200609733 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 = 8.200609733 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + u = 8.200609733 + -1.5 u = 8.200609733 + -1.5 Combine like terms: 8.200609733 + -1.5 = 6.700609733 u = 6.700609733 Simplifying u = 6.700609733

Subproblem 2

u + 1.5 = -8.200609733 Simplifying u + 1.5 = -8.200609733 Reorder the terms: 1.5 + u = -8.200609733 Solving 1.5 + u = -8.200609733 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 = -8.200609733 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + u = -8.200609733 + -1.5 u = -8.200609733 + -1.5 Combine like terms: -8.200609733 + -1.5 = -9.700609733 u = -9.700609733 Simplifying u = -9.700609733

Solution

The solution to the problem is based on the solutions from the subproblems. u = {6.700609733, -9.700609733}

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