What is the product? (9t-4)(-9t-4) a) -81t^2-16 b)-81t^2+16 c)-81t^2 - 72t+16 d)-81t^2 +72t+16

asked Dec 27, 2019 27.0k views

2 votes

What is the product?

(9t-4)(-9t-4)

a) -81t^2-16
b)-81t^2+16
c)-81t^2 - 72t+16
d)-81t^2 +72t+16

by Tute

8.9k points

Please log in or register to add a comment.

6 votes

B) is correct
a=-4
b=9t
(a+b)(a-b)=a^2-b^2=16-81t^2