3n^2-12n=30

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Solution for 3n^2-12n=30 equation:


Simplifying
3n2 + -12n = 30

Reorder the terms:
-12n + 3n2 = 30

Solving
-12n + 3n2 = 30

Solving for variable 'n'.

Reorder the terms:
-30 + -12n + 3n2 = 30 + -30

Combine like terms: 30 + -30 = 0
-30 + -12n + 3n2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-10 + -4n + n2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-10 + -4n + n2)' equal to zero and attempt to solve: Simplifying -10 + -4n + n2 = 0 Solving -10 + -4n + n2 = 0 Begin completing the square. Move the constant term to the right: Add '10' to each side of the equation. -10 + -4n + 10 + n2 = 0 + 10 Reorder the terms: -10 + 10 + -4n + n2 = 0 + 10 Combine like terms: -10 + 10 = 0 0 + -4n + n2 = 0 + 10 -4n + n2 = 0 + 10 Combine like terms: 0 + 10 = 10 -4n + n2 = 10 The n term is -4n. Take half its coefficient (-2). Square it (4) and add it to both sides. Add '4' to each side of the equation. -4n + 4 + n2 = 10 + 4 Reorder the terms: 4 + -4n + n2 = 10 + 4 Combine like terms: 10 + 4 = 14 4 + -4n + n2 = 14 Factor a perfect square on the left side: (n + -2)(n + -2) = 14 Calculate the square root of the right side: 3.741657387 Break this problem into two subproblems by setting (n + -2) equal to 3.741657387 and -3.741657387.

Subproblem 1

n + -2 = 3.741657387 Simplifying n + -2 = 3.741657387 Reorder the terms: -2 + n = 3.741657387 Solving -2 + n = 3.741657387 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = 3.741657387 + 2 Combine like terms: -2 + 2 = 0 0 + n = 3.741657387 + 2 n = 3.741657387 + 2 Combine like terms: 3.741657387 + 2 = 5.741657387 n = 5.741657387 Simplifying n = 5.741657387

Subproblem 2

n + -2 = -3.741657387 Simplifying n + -2 = -3.741657387 Reorder the terms: -2 + n = -3.741657387 Solving -2 + n = -3.741657387 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + n = -3.741657387 + 2 Combine like terms: -2 + 2 = 0 0 + n = -3.741657387 + 2 n = -3.741657387 + 2 Combine like terms: -3.741657387 + 2 = -1.741657387 n = -1.741657387 Simplifying n = -1.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. n = {5.741657387, -1.741657387}

Solution

n = {5.741657387, -1.741657387}

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