Simplify: (3a – 4b)(a + b)

A.
3a2– ab – 4b2

B.
3a2 – 7ab – 4b2

C.
3a2 – 12ab – 4b2

D.
3a2 + ab – 4b2

Question

Simplify: (3a – 4b)(a + b)
 
 A.
3a2– ab – 4b2
 
 B.
3a2 – 7ab – 4b2
 
 C.
3a2 – 12ab – 4b2
 
 D.
3a2 + ab – 4b2

anonymous · Answer

(3a−4b)(a+b)
=(3a+(−4b))(a+b)
=(3a)(a)+(3a)(b)+(−4b)(a)+(−4b)(b)
=3a2+3ab−4ab−4b2
=3a2−ab−4b2

whpalmer4 · Answer

multiply each part of the first quantity (3a-4b) by each part of the second quantity (a+b)
collect like terms to simplify.

anonymous · Answer

So the answer is A. :) I broke it down for you.

anonymous · Answer

thank you!

anonymous · Answer

anonymous · Answer

No problem @kira12341234 !! :D

anonymous · Answer

wow thanks everyone! and @mathpapa  thanks for the link!

anonymous · Answer

lol, you are not the real math papa