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5 August, 23:06

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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Answers (1)
  1. 5 August, 23:13
    0
    B) is correct

    a=-4

    b=9t

    (a+b) (a-b) = a^2-b^2=16-81t^2
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