2(a+3)-1-3a(2a-5)=

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Solution for 2(a+3)-1-3a(2a-5)= equation:


Simplifying
2(a + 3) + -1 + -3a(2a + -5) = 0

Reorder the terms:
2(3 + a) + -1 + -3a(2a + -5) = 0
(3 * 2 + a * 2) + -1 + -3a(2a + -5) = 0
(6 + 2a) + -1 + -3a(2a + -5) = 0

Reorder the terms:
6 + 2a + -1 + -3a(-5 + 2a) = 0
6 + 2a + -1 + (-5 * -3a + 2a * -3a) = 0
6 + 2a + -1 + (15a + -6a2) = 0

Reorder the terms:
6 + -1 + 2a + 15a + -6a2 = 0

Combine like terms: 6 + -1 = 5
5 + 2a + 15a + -6a2 = 0

Combine like terms: 2a + 15a = 17a
5 + 17a + -6a2 = 0

Solving
5 + 17a + -6a2 = 0

Solving for variable 'a'.

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
-0.8333333333 + -2.833333333a + a2 = 0

Move the constant term to the right:

Add '0.8333333333' to each side of the equation.
-0.8333333333 + -2.833333333a + 0.8333333333 + a2 = 0 + 0.8333333333

Reorder the terms:
-0.8333333333 + 0.8333333333 + -2.833333333a + a2 = 0 + 0.8333333333

Combine like terms: -0.8333333333 + 0.8333333333 = 0.0000000000
0.0000000000 + -2.833333333a + a2 = 0 + 0.8333333333
-2.833333333a + a2 = 0 + 0.8333333333

Combine like terms: 0 + 0.8333333333 = 0.8333333333
-2.833333333a + a2 = 0.8333333333

The a term is -2.833333333a.  Take half its coefficient (-1.416666667).
Square it (2.006944445) and add it to both sides.

Add '2.006944445' to each side of the equation.
-2.833333333a + 2.006944445 + a2 = 0.8333333333 + 2.006944445

Reorder the terms:
2.006944445 + -2.833333333a + a2 = 0.8333333333 + 2.006944445

Combine like terms: 0.8333333333 + 2.006944445 = 2.8402777783
2.006944445 + -2.833333333a + a2 = 2.8402777783

Factor a perfect square on the left side:
(a + -1.416666667)(a + -1.416666667) = 2.8402777783

Calculate the square root of the right side: 1.685312368

Break this problem into two subproblems by setting 
(a + -1.416666667) equal to 1.685312368 and -1.685312368.

Subproblem 1

a + -1.416666667 = 1.685312368 Simplifying a + -1.416666667 = 1.685312368 Reorder the terms: -1.416666667 + a = 1.685312368 Solving -1.416666667 + a = 1.685312368 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.416666667' to each side of the equation. -1.416666667 + 1.416666667 + a = 1.685312368 + 1.416666667 Combine like terms: -1.416666667 + 1.416666667 = 0.000000000 0.000000000 + a = 1.685312368 + 1.416666667 a = 1.685312368 + 1.416666667 Combine like terms: 1.685312368 + 1.416666667 = 3.101979035 a = 3.101979035 Simplifying a = 3.101979035

Subproblem 2

a + -1.416666667 = -1.685312368 Simplifying a + -1.416666667 = -1.685312368 Reorder the terms: -1.416666667 + a = -1.685312368 Solving -1.416666667 + a = -1.685312368 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1.416666667' to each side of the equation. -1.416666667 + 1.416666667 + a = -1.685312368 + 1.416666667 Combine like terms: -1.416666667 + 1.416666667 = 0.000000000 0.000000000 + a = -1.685312368 + 1.416666667 a = -1.685312368 + 1.416666667 Combine like terms: -1.685312368 + 1.416666667 = -0.268645701 a = -0.268645701 Simplifying a = -0.268645701

Solution

The solution to the problem is based on the solutions from the subproblems. a = {3.101979035, -0.268645701}

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