3a(a+18)=18

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Solution for 3a(a+18)=18 equation:


Simplifying
3a(a + 18) = 18

Reorder the terms:
3a(18 + a) = 18
(18 * 3a + a * 3a) = 18
(54a + 3a2) = 18

Solving
54a + 3a2 = 18

Solving for variable 'a'.

Reorder the terms:
-18 + 54a + 3a2 = 18 + -18

Combine like terms: 18 + -18 = 0
-18 + 54a + 3a2 = 0

Factor out the Greatest Common Factor (GCF), '3'.
3(-6 + 18a + a2) = 0

Ignore the factor 3.

Subproblem 1

Set the factor '(-6 + 18a + a2)' equal to zero and attempt to solve: Simplifying -6 + 18a + a2 = 0 Solving -6 + 18a + a2 = 0 Begin completing the square. Move the constant term to the right: Add '6' to each side of the equation. -6 + 18a + 6 + a2 = 0 + 6 Reorder the terms: -6 + 6 + 18a + a2 = 0 + 6 Combine like terms: -6 + 6 = 0 0 + 18a + a2 = 0 + 6 18a + a2 = 0 + 6 Combine like terms: 0 + 6 = 6 18a + a2 = 6 The a term is 18a. Take half its coefficient (9). Square it (81) and add it to both sides. Add '81' to each side of the equation. 18a + 81 + a2 = 6 + 81 Reorder the terms: 81 + 18a + a2 = 6 + 81 Combine like terms: 6 + 81 = 87 81 + 18a + a2 = 87 Factor a perfect square on the left side: (a + 9)(a + 9) = 87 Calculate the square root of the right side: 9.327379053 Break this problem into two subproblems by setting (a + 9) equal to 9.327379053 and -9.327379053.

Subproblem 1

a + 9 = 9.327379053 Simplifying a + 9 = 9.327379053 Reorder the terms: 9 + a = 9.327379053 Solving 9 + a = 9.327379053 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + a = 9.327379053 + -9 Combine like terms: 9 + -9 = 0 0 + a = 9.327379053 + -9 a = 9.327379053 + -9 Combine like terms: 9.327379053 + -9 = 0.327379053 a = 0.327379053 Simplifying a = 0.327379053

Subproblem 2

a + 9 = -9.327379053 Simplifying a + 9 = -9.327379053 Reorder the terms: 9 + a = -9.327379053 Solving 9 + a = -9.327379053 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + a = -9.327379053 + -9 Combine like terms: 9 + -9 = 0 0 + a = -9.327379053 + -9 a = -9.327379053 + -9 Combine like terms: -9.327379053 + -9 = -18.327379053 a = -18.327379053 Simplifying a = -18.327379053

Solution

The solution to the problem is based on the solutions from the subproblems. a = {0.327379053, -18.327379053}

Solution

a = {0.327379053, -18.327379053}

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