Question

Simplify: (3a – 4b)(a + b)

A.
3a2– ab – 4b2

B.
3a2 – 7ab – 4b2

C.
3a2 – 12ab – 4b2

D.
3a2 + ab – 4b2

Answer 1

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

Answer 2

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

Answer 3

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

Answer 4

thank you!

Answer 5

http://www.mathpapa.com/algebra-calculator.html?q=%283a%20%u2013%204b%29%28a%20+%20b%29

3a^2-ab-4b^2

Answer 6

No problem @kira12341234 !! :D

Answer 7

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

Answer 8

lol, you are not the real math papa