Annabethh1948 Annabethh1948

21-12-2018
Mathematics

contestada

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

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meadow77 meadow77

21-12-2018

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

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