(n-5)(n+30)=48

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Solution for (n-5)(n+30)=48 equation:


Simplifying
(n + -5)(n + 30) = 48

Reorder the terms:
(-5 + n)(n + 30) = 48

Reorder the terms:
(-5 + n)(30 + n) = 48

Multiply (-5 + n) * (30 + n)
(-5(30 + n) + n(30 + n)) = 48
((30 * -5 + n * -5) + n(30 + n)) = 48
((-150 + -5n) + n(30 + n)) = 48
(-150 + -5n + (30 * n + n * n)) = 48
(-150 + -5n + (30n + n2)) = 48

Combine like terms: -5n + 30n = 25n
(-150 + 25n + n2) = 48

Solving
-150 + 25n + n2 = 48

Solving for variable 'n'.

Reorder the terms:
-150 + -48 + 25n + n2 = 48 + -48

Combine like terms: -150 + -48 = -198
-198 + 25n + n2 = 48 + -48

Combine like terms: 48 + -48 = 0
-198 + 25n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '198' to each side of the equation.
-198 + 25n + 198 + n2 = 0 + 198

Reorder the terms:
-198 + 198 + 25n + n2 = 0 + 198

Combine like terms: -198 + 198 = 0
0 + 25n + n2 = 0 + 198
25n + n2 = 0 + 198

Combine like terms: 0 + 198 = 198
25n + n2 = 198

The n term is 25n.  Take half its coefficient (12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
25n + 156.25 + n2 = 198 + 156.25

Reorder the terms:
156.25 + 25n + n2 = 198 + 156.25

Combine like terms: 198 + 156.25 = 354.25
156.25 + 25n + n2 = 354.25

Factor a perfect square on the left side:
(n + 12.5)(n + 12.5) = 354.25

Calculate the square root of the right side: 18.821530225

Break this problem into two subproblems by setting 
(n + 12.5) equal to 18.821530225 and -18.821530225.

Subproblem 1

n + 12.5 = 18.821530225 Simplifying n + 12.5 = 18.821530225 Reorder the terms: 12.5 + n = 18.821530225 Solving 12.5 + n = 18.821530225 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + n = 18.821530225 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + n = 18.821530225 + -12.5 n = 18.821530225 + -12.5 Combine like terms: 18.821530225 + -12.5 = 6.321530225 n = 6.321530225 Simplifying n = 6.321530225

Subproblem 2

n + 12.5 = -18.821530225 Simplifying n + 12.5 = -18.821530225 Reorder the terms: 12.5 + n = -18.821530225 Solving 12.5 + n = -18.821530225 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '-12.5' to each side of the equation. 12.5 + -12.5 + n = -18.821530225 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + n = -18.821530225 + -12.5 n = -18.821530225 + -12.5 Combine like terms: -18.821530225 + -12.5 = -31.321530225 n = -31.321530225 Simplifying n = -31.321530225

Solution

The solution to the problem is based on the solutions from the subproblems. n = {6.321530225, -31.321530225}

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