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

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

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

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

Reorder the terms:
-3 + 6a + -1a + 2a2 = 0

Combine like terms: 6a + -1a = 5a
-3 + 5a + 2a2 = 0

Solving
-3 + 5a + 2a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(-3 + -1a)(1 + -2a) = 0

Subproblem 1
Set the factor '(-3 + -1a)' equal to zero and attempt to solve:

Simplifying
-3 + -1a = 0

Solving
-3 + -1a = 0

Move all terms containing a to the left, all other terms to the right.

Add '3' to each side of the equation.
-3 + 3 + -1a = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -1a = 0 + 3
-1a = 0 + 3

Combine like terms: 0 + 3 = 3
-1a = 3

Divide each side by '-1'.
a = -3

Simplifying
a = -3
Subproblem 2
Set the factor '(1 + -2a)' equal to zero and attempt to solve:

Simplifying
1 + -2a = 0

Solving
1 + -2a = 0

Move all terms containing a to the left, all other terms to the right.

Add '-1' to each side of the equation.
1 + -1 + -2a = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -2a = 0 + -1
-2a = 0 + -1

Combine like terms: 0 + -1 = -1
-2a = -1

Divide each side by '-2'.
a = 0.5

Simplifying
a = 0.5
Solution
a = {-3, 0.5}