3(2a+5)+2(3-a)a=4

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Solution for 3(2a+5)+2(3-a)a=4 equation:


Simplifying
3(2a + 5) + 2(3 + -1a) * a = 4

Reorder the terms:
3(5 + 2a) + 2(3 + -1a) * a = 4
(5 * 3 + 2a * 3) + 2(3 + -1a) * a = 4
(15 + 6a) + 2(3 + -1a) * a = 4

Reorder the terms for easier multiplication:
15 + 6a + 2a(3 + -1a) = 4
15 + 6a + (3 * 2a + -1a * 2a) = 4
15 + 6a + (6a + -2a2) = 4

Combine like terms: 6a + 6a = 12a
15 + 12a + -2a2 = 4

Solving
15 + 12a + -2a2 = 4

Solving for variable 'a'.

Reorder the terms:
15 + -4 + 12a + -2a2 = 4 + -4

Combine like terms: 15 + -4 = 11
11 + 12a + -2a2 = 4 + -4

Combine like terms: 4 + -4 = 0
11 + 12a + -2a2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-5.5 + -6a + a2 = 0

Move the constant term to the right:

Add '5.5' to each side of the equation.
-5.5 + -6a + 5.5 + a2 = 0 + 5.5

Reorder the terms:
-5.5 + 5.5 + -6a + a2 = 0 + 5.5

Combine like terms: -5.5 + 5.5 = 0.0
0.0 + -6a + a2 = 0 + 5.5
-6a + a2 = 0 + 5.5

Combine like terms: 0 + 5.5 = 5.5
-6a + a2 = 5.5

The a term is -6a.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6a + 9 + a2 = 5.5 + 9

Reorder the terms:
9 + -6a + a2 = 5.5 + 9

Combine like terms: 5.5 + 9 = 14.5
9 + -6a + a2 = 14.5

Factor a perfect square on the left side:
(a + -3)(a + -3) = 14.5

Calculate the square root of the right side: 3.807886553

Break this problem into two subproblems by setting 
(a + -3) equal to 3.807886553 and -3.807886553.

Subproblem 1

a + -3 = 3.807886553 Simplifying a + -3 = 3.807886553 Reorder the terms: -3 + a = 3.807886553 Solving -3 + a = 3.807886553 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + a = 3.807886553 + 3 Combine like terms: -3 + 3 = 0 0 + a = 3.807886553 + 3 a = 3.807886553 + 3 Combine like terms: 3.807886553 + 3 = 6.807886553 a = 6.807886553 Simplifying a = 6.807886553

Subproblem 2

a + -3 = -3.807886553 Simplifying a + -3 = -3.807886553 Reorder the terms: -3 + a = -3.807886553 Solving -3 + a = -3.807886553 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + a = -3.807886553 + 3 Combine like terms: -3 + 3 = 0 0 + a = -3.807886553 + 3 a = -3.807886553 + 3 Combine like terms: -3.807886553 + 3 = -0.807886553 a = -0.807886553 Simplifying a = -0.807886553

Solution

The solution to the problem is based on the solutions from the subproblems. a = {6.807886553, -0.807886553}

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