4a-b

Evaluate the expression when a=5 and b=-7

The answer would be 27 for your information

27

Step-by-step explanation:

So first we need to plug in 5 as the variable a and - 7 as the variable b

4 (5) - (-7)

Next we multiply the 4 and the 5 together to get 20

4 (5) = 20 or 4 x 5 = 20

20 - (-7)

Now we subtract negative 7 from 20

20 - (-7) = 27

This can also be written as 20 plus 7 as a mathematical rule states: two negatives make a positive. So:

20 - (-7) = 20 + 7

Both of these are equivalent in every sense of the word and give us our final answer of 27