(n-1)(n-12)=7n

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Solution for (n-1)(n-12)=7n equation:


Simplifying
(n + -1)(n + -12) = 7n

Reorder the terms:
(-1 + n)(n + -12) = 7n

Reorder the terms:
(-1 + n)(-12 + n) = 7n

Multiply (-1 + n) * (-12 + n)
(-1(-12 + n) + n(-12 + n)) = 7n
((-12 * -1 + n * -1) + n(-12 + n)) = 7n
((12 + -1n) + n(-12 + n)) = 7n
(12 + -1n + (-12 * n + n * n)) = 7n
(12 + -1n + (-12n + n2)) = 7n

Combine like terms: -1n + -12n = -13n
(12 + -13n + n2) = 7n

Solving
12 + -13n + n2 = 7n

Solving for variable 'n'.

Reorder the terms:
12 + -13n + -7n + n2 = 7n + -7n

Combine like terms: -13n + -7n = -20n
12 + -20n + n2 = 7n + -7n

Combine like terms: 7n + -7n = 0
12 + -20n + n2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-12' to each side of the equation.
12 + -20n + -12 + n2 = 0 + -12

Reorder the terms:
12 + -12 + -20n + n2 = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -20n + n2 = 0 + -12
-20n + n2 = 0 + -12

Combine like terms: 0 + -12 = -12
-20n + n2 = -12

The n term is -20n.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20n + 100 + n2 = -12 + 100

Reorder the terms:
100 + -20n + n2 = -12 + 100

Combine like terms: -12 + 100 = 88
100 + -20n + n2 = 88

Factor a perfect square on the left side:
(n + -10)(n + -10) = 88

Calculate the square root of the right side: 9.38083152

Break this problem into two subproblems by setting 
(n + -10) equal to 9.38083152 and -9.38083152.

Subproblem 1

n + -10 = 9.38083152 Simplifying n + -10 = 9.38083152 Reorder the terms: -10 + n = 9.38083152 Solving -10 + n = 9.38083152 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + n = 9.38083152 + 10 Combine like terms: -10 + 10 = 0 0 + n = 9.38083152 + 10 n = 9.38083152 + 10 Combine like terms: 9.38083152 + 10 = 19.38083152 n = 19.38083152 Simplifying n = 19.38083152

Subproblem 2

n + -10 = -9.38083152 Simplifying n + -10 = -9.38083152 Reorder the terms: -10 + n = -9.38083152 Solving -10 + n = -9.38083152 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + n = -9.38083152 + 10 Combine like terms: -10 + 10 = 0 0 + n = -9.38083152 + 10 n = -9.38083152 + 10 Combine like terms: -9.38083152 + 10 = 0.61916848 n = 0.61916848 Simplifying n = 0.61916848

Solution

The solution to the problem is based on the solutions from the subproblems. n = {19.38083152, 0.61916848}

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