(1-5a)(1-4a)=

Solution for (1-5a)(1-4a)= equation:

Simplifying
(1 + -5a)(1 + -4a) = 0

Multiply (1 + -5a) * (1 + -4a)
(1(1 + -4a) + -5a * (1 + -4a)) = 0
((1 * 1 + -4a * 1) + -5a * (1 + -4a)) = 0
((1 + -4a) + -5a * (1 + -4a)) = 0
(1 + -4a + (1 * -5a + -4a * -5a)) = 0
(1 + -4a + (-5a + 20a2)) = 0

Combine like terms: -4a + -5a = -9a
(1 + -9a + 20a2) = 0

Solving
1 + -9a + 20a2 = 0

Solving for variable 'a'.

Factor a trinomial.
(1 + -5a)(1 + -4a) = 0

Subproblem 1
Set the factor '(1 + -5a)' equal to zero and attempt to solve:

Simplifying
1 + -5a = 0

Solving
1 + -5a = 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 + -5a = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -5a = 0 + -1
-5a = 0 + -1

Combine like terms: 0 + -1 = -1
-5a = -1

Divide each side by '-5'.
a = 0.2

Simplifying
a = 0.2
Subproblem 2
Set the factor '(1 + -4a)' equal to zero and attempt to solve:

Simplifying
1 + -4a = 0

Solving
1 + -4a = 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 + -4a = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -4a = 0 + -1
-4a = 0 + -1

Combine like terms: 0 + -1 = -1
-4a = -1

Divide each side by '-4'.
a = 0.25

Simplifying
a = 0.25
Solution
a = {0.2, 0.25}