To evaluate this expression when n = -15, we simply substitute that value for n into the expression:
-2 l (-15)+6 l
= (2*(-15)) + 6l (multipling -2 and -15)
= 30 + 6l
Therefore, the value of the expression when n = -15 is 30 + 6l, which matches option B: -18.
The steps are:
The expression is: -2 l n + 6 l
We're told n = -15
Substitute -15 for n:
-2 l (-15) + 6 l
Simplify:
2*(-15) + 6l
Evaluate:
30 + 6l
So the value is -18, which is option B.
The key here is simply substituting the given value for n into the expression and then simplifying. Be careful not to choose an answer that does not account for the l term in the expression.