Plz evaluate 3(a – 4b) when a = –2 and b = 5. a. -54 b. -56 c. 39 d. 54

Plug in the points.

3(a-4b) a=-2 b=5

3(-2-4*5)

Work in the parenthesis first. (-2-20)

-22

-22*3= -66

I think you wrote your answer choices wrong because I checked my answer. I made sure to use PEMDAS as well.

I hope this helps!
~cupcake

All you do is insert -2 for a and 5 for b. So it becomes: 3(-2-4[5]). First you solve inside the parentheses because of pemdas (parentheses, exponents, multiplication/division, and addition/subtraction). The next step is multiplication, so you multiply -4 by 5 and end up with -20. So the problem is now 3(-2-20). Next you subtract -2 by 20 and get -22. Finally all you have left is 3(-22) Multiply that and get -66.

I'm sorry none of the answers worked but I triple checked my work. Many there's a typo?