4а-15в-2при а=1/4, в=3/5

To evaluate the expression 4a - 15b - 2 with a = 1/4 and b = 3/5, substitute the given values into the expression:

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

Simplify each term:

= 1 - 45/5 - 2 = 1 - 9 - 2

Perform the arithmetic:

= -10

Therefore, when a = 1/4 and b = 3/5, the expression 4a - 15b - 2 equals -10.