.5n(n-3)=377

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Solution for .5n(n-3)=377 equation:


Simplifying
0.5n(n + -3) = 377

Reorder the terms:
0.5n(-3 + n) = 377
(-3 * 0.5n + n * 0.5n) = 377
(-1.5n + 0.5n2) = 377

Solving
-1.5n + 0.5n2 = 377

Solving for variable 'n'.

Reorder the terms:
-377 + -1.5n + 0.5n2 = 377 + -377

Combine like terms: 377 + -377 = 0
-377 + -1.5n + 0.5n2 = 0

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

Divide each side by '0.5'.
-754 + -3n + n2 = 0

Move the constant term to the right:

Add '754' to each side of the equation.
-754 + -3n + 754 + n2 = 0 + 754

Reorder the terms:
-754 + 754 + -3n + n2 = 0 + 754

Combine like terms: -754 + 754 = 0
0 + -3n + n2 = 0 + 754
-3n + n2 = 0 + 754

Combine like terms: 0 + 754 = 754
-3n + n2 = 754

The n term is -3n.  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.
-3n + 2.25 + n2 = 754 + 2.25

Reorder the terms:
2.25 + -3n + n2 = 754 + 2.25

Combine like terms: 754 + 2.25 = 756.25
2.25 + -3n + n2 = 756.25

Factor a perfect square on the left side:
(n + -1.5)(n + -1.5) = 756.25

Calculate the square root of the right side: 27.5

Break this problem into two subproblems by setting 
(n + -1.5) equal to 27.5 and -27.5.

Subproblem 1

n + -1.5 = 27.5 Simplifying n + -1.5 = 27.5 Reorder the terms: -1.5 + n = 27.5 Solving -1.5 + n = 27.5 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + n = 27.5 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + n = 27.5 + 1.5 n = 27.5 + 1.5 Combine like terms: 27.5 + 1.5 = 29 n = 29 Simplifying n = 29

Subproblem 2

n + -1.5 = -27.5 Simplifying n + -1.5 = -27.5 Reorder the terms: -1.5 + n = -27.5 Solving -1.5 + n = -27.5 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + n = -27.5 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + n = -27.5 + 1.5 n = -27.5 + 1.5 Combine like terms: -27.5 + 1.5 = -26 n = -26 Simplifying n = -26

Solution

The solution to the problem is based on the solutions from the subproblems. n = {29, -26}

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