(a-3)(4a-9a-3)=

Solution for (a-3)(4a-9a-3)= equation:

Simplifying
(a + -3)(4a + -9a + -3) = 0

Reorder the terms:
(-3 + a)(4a + -9a + -3) = 0

Reorder the terms:
(-3 + a)(-3 + 4a + -9a) = 0

Combine like terms: 4a + -9a = -5a
(-3 + a)(-3 + -5a) = 0

Multiply (-3 + a) * (-3 + -5a)
(-3(-3 + -5a) + a(-3 + -5a)) = 0
((-3 * -3 + -5a * -3) + a(-3 + -5a)) = 0
((9 + 15a) + a(-3 + -5a)) = 0
(9 + 15a + (-3 * a + -5a * a)) = 0
(9 + 15a + (-3a + -5a2)) = 0

Combine like terms: 15a + -3a = 12a
(9 + 12a + -5a2) = 0

Solving
9 + 12a + -5a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(3 + -1a)(3 + 5a) = 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 '(3 + 5a)' equal to zero and attempt to solve:

Simplifying
3 + 5a = 0

Solving
3 + 5a = 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 + 5a = 0 + -3

Combine like terms: 3 + -3 = 0
0 + 5a = 0 + -3
5a = 0 + -3

Combine like terms: 0 + -3 = -3
5a = -3

Divide each side by '5'.
a = -0.6

Simplifying
a = -0.6
Solution
a = {3, -0.6}