What is the value of the expression 8a−3b when a=2 and b=−5?

To determine the value of the expression (8a - 3b) when (a = 2) and (b = -5), start by substituting the given values into the expression.

First, substitute (a = 2) and (b = -5):

[

8a - 3b = 8(2) - 3(-5)

]

Now calculate (8(2)):

[

8(2) = 16

]

Next, calculate (-3(-5)):

[

-3(-5) = 15

]

Now combine these results:

[

16 + 15 = 31

]

Thus, the evaluated expression (8a - 3b) simplifies to 31 when substituting the values for (a) and (b). Hence, the correct answer is 31.