3a^2-6a=15

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Solution for 3a^2-6a=15 equation:


Simplifying
3a2 + -6a = 15

Reorder the terms:
-6a + 3a2 = 15

Solving
-6a + 3a2 = 15

Solving for variable 'a'.

Reorder the terms:
-15 + -6a + 3a2 = 15 + -15

Combine like terms: 15 + -15 = 0
-15 + -6a + 3a2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-5 + -2a + a2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-5 + -2a + a2)' equal to zero and attempt to solve: Simplifying -5 + -2a + a2 = 0 Solving -5 + -2a + a2 = 0 Begin completing the square. Move the constant term to the right: Add '5' to each side of the equation. -5 + -2a + 5 + a2 = 0 + 5 Reorder the terms: -5 + 5 + -2a + a2 = 0 + 5 Combine like terms: -5 + 5 = 0 0 + -2a + a2 = 0 + 5 -2a + a2 = 0 + 5 Combine like terms: 0 + 5 = 5 -2a + a2 = 5 The a term is -2a. Take half its coefficient (-1). Square it (1) and add it to both sides. Add '1' to each side of the equation. -2a + 1 + a2 = 5 + 1 Reorder the terms: 1 + -2a + a2 = 5 + 1 Combine like terms: 5 + 1 = 6 1 + -2a + a2 = 6 Factor a perfect square on the left side: (a + -1)(a + -1) = 6 Calculate the square root of the right side: 2.449489743 Break this problem into two subproblems by setting (a + -1) equal to 2.449489743 and -2.449489743.

Subproblem 1

a + -1 = 2.449489743 Simplifying a + -1 = 2.449489743 Reorder the terms: -1 + a = 2.449489743 Solving -1 + a = 2.449489743 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + a = 2.449489743 + 1 Combine like terms: -1 + 1 = 0 0 + a = 2.449489743 + 1 a = 2.449489743 + 1 Combine like terms: 2.449489743 + 1 = 3.449489743 a = 3.449489743 Simplifying a = 3.449489743

Subproblem 2

a + -1 = -2.449489743 Simplifying a + -1 = -2.449489743 Reorder the terms: -1 + a = -2.449489743 Solving -1 + a = -2.449489743 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + a = -2.449489743 + 1 Combine like terms: -1 + 1 = 0 0 + a = -2.449489743 + 1 a = -2.449489743 + 1 Combine like terms: -2.449489743 + 1 = -1.449489743 a = -1.449489743 Simplifying a = -1.449489743

Solution

The solution to the problem is based on the solutions from the subproblems. a = {3.449489743, -1.449489743}

Solution

a = {3.449489743, -1.449489743}

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