Hey there!
All you have to do is DISTRIBUTE
Here’s the formula:
a(b + c) = a(b) + a(c) = ab + ac
NOW LETS SOLVE FOR YOUR QUESTION
• 3a(a – 4b)
• 3a(a) + 3a(4b)
• 3a(a) = 3a² ⬅️ FRONT number
• 3a(4b) = 12ab ⬅️ BACK number
• Answer: 3a² + 12ab ☑️
Good luck on your assignment and enjoy your day!
~LoveYourselfFirst:)