3n^2+12n-9=0

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Solution for 3n^2+12n-9=0 equation:


Simplifying
3n2 + 12n + -9 = 0

Reorder the terms:
-9 + 12n + 3n2 = 0

Solving
-9 + 12n + 3n2 = 0

Solving for variable 'n'.

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

Ignore the factor 3.

Subproblem 1

Set the factor '(-3 + 4n + n2)' equal to zero and attempt to solve: Simplifying -3 + 4n + n2 = 0 Solving -3 + 4n + n2 = 0 Begin completing the square. Move the constant term to the right: Add '3' to each side of the equation. -3 + 4n + 3 + n2 = 0 + 3 Reorder the terms: -3 + 3 + 4n + n2 = 0 + 3 Combine like terms: -3 + 3 = 0 0 + 4n + n2 = 0 + 3 4n + n2 = 0 + 3 Combine like terms: 0 + 3 = 3 4n + n2 = 3 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 = 3 + 4 Reorder the terms: 4 + 4n + n2 = 3 + 4 Combine like terms: 3 + 4 = 7 4 + 4n + n2 = 7 Factor a perfect square on the left side: (n + 2)(n + 2) = 7 Calculate the square root of the right side: 2.645751311 Break this problem into two subproblems by setting (n + 2) equal to 2.645751311 and -2.645751311.

Subproblem 1

n + 2 = 2.645751311 Simplifying n + 2 = 2.645751311 Reorder the terms: 2 + n = 2.645751311 Solving 2 + n = 2.645751311 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 = 2.645751311 + -2 Combine like terms: 2 + -2 = 0 0 + n = 2.645751311 + -2 n = 2.645751311 + -2 Combine like terms: 2.645751311 + -2 = 0.645751311 n = 0.645751311 Simplifying n = 0.645751311

Subproblem 2

n + 2 = -2.645751311 Simplifying n + 2 = -2.645751311 Reorder the terms: 2 + n = -2.645751311 Solving 2 + n = -2.645751311 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 = -2.645751311 + -2 Combine like terms: 2 + -2 = 0 0 + n = -2.645751311 + -2 n = -2.645751311 + -2 Combine like terms: -2.645751311 + -2 = -4.645751311 n = -4.645751311 Simplifying n = -4.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. n = {0.645751311, -4.645751311}

Solution

n = {0.645751311, -4.645751311}

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