4а-15в-2при а=1/4, в=3/5

To find the value of the expression 4а - 15в - 2, we can substitute the given values.

Given: a = 1/4 b = 3/5

Replacing a and b in the expression, we have:

4(1/4) - 15(3/5) - 2

Simplifying each term, we get:

1 - (45/5) - 2

1 - 9 - 2

-10

So, when a = 1/4 and b = 3/5, the value of the expression 4а - 15в - 2 is -10.