5n^2-30n=100

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Solution for 5n^2-30n=100 equation:


Simplifying
5n2 + -30n = 100

Reorder the terms:
-30n + 5n2 = 100

Solving
-30n + 5n2 = 100

Solving for variable 'n'.

Reorder the terms:
-100 + -30n + 5n2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + -30n + 5n2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(-20 + -6n + n2) = 0

Ignore the factor 5.

Subproblem 1

Set the factor '(-20 + -6n + n2)' equal to zero and attempt to solve: Simplifying -20 + -6n + n2 = 0 Solving -20 + -6n + n2 = 0 Begin completing the square. Move the constant term to the right: Add '20' to each side of the equation. -20 + -6n + 20 + n2 = 0 + 20 Reorder the terms: -20 + 20 + -6n + n2 = 0 + 20 Combine like terms: -20 + 20 = 0 0 + -6n + n2 = 0 + 20 -6n + n2 = 0 + 20 Combine like terms: 0 + 20 = 20 -6n + n2 = 20 The n term is -6n. Take half its coefficient (-3). Square it (9) and add it to both sides. Add '9' to each side of the equation. -6n + 9 + n2 = 20 + 9 Reorder the terms: 9 + -6n + n2 = 20 + 9 Combine like terms: 20 + 9 = 29 9 + -6n + n2 = 29 Factor a perfect square on the left side: (n + -3)(n + -3) = 29 Calculate the square root of the right side: 5.385164807 Break this problem into two subproblems by setting (n + -3) equal to 5.385164807 and -5.385164807.

Subproblem 1

n + -3 = 5.385164807 Simplifying n + -3 = 5.385164807 Reorder the terms: -3 + n = 5.385164807 Solving -3 + n = 5.385164807 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + n = 5.385164807 + 3 Combine like terms: -3 + 3 = 0 0 + n = 5.385164807 + 3 n = 5.385164807 + 3 Combine like terms: 5.385164807 + 3 = 8.385164807 n = 8.385164807 Simplifying n = 8.385164807

Subproblem 2

n + -3 = -5.385164807 Simplifying n + -3 = -5.385164807 Reorder the terms: -3 + n = -5.385164807 Solving -3 + n = -5.385164807 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + n = -5.385164807 + 3 Combine like terms: -3 + 3 = 0 0 + n = -5.385164807 + 3 n = -5.385164807 + 3 Combine like terms: -5.385164807 + 3 = -2.385164807 n = -2.385164807 Simplifying n = -2.385164807

Solution

The solution to the problem is based on the solutions from the subproblems. n = {8.385164807, -2.385164807}

Solution

n = {8.385164807, -2.385164807}

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