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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

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
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

User Tute
by
8.9k points

1 Answer

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


User Andrea Olivato
by
8.9k points
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User Hugerde
asked Apr 13, 2017 73.9k views
What is the product? (9t − 4)(−9t − 4) −81t2 − 16 −81t2 16 −81t2 − 72t 16 −81t2 72t 16
Hugerde asked Apr 13, 2017
by Hugerde
8.4k points
1 answer
2 votes
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