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Which of the following expressions is equal to -×^2-81? A. (-x+9i)(x-9i) B.(x+9i)(x-9i) C.(-x-9i)(x-9i) D.(-x-9i)(x+9i)
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4 votes
Which of the following expressions is equal to -×^2-81?

A. (-x+9i)(x-9i)
B.(x+9i)(x-9i)
C.(-x-9i)(x-9i)
D.(-x-9i)(x+9i)

User Berrberr
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1 Answer

5 votes

-x^2-81=-(x^2+81)=-(x^2-(9i)^2)=-(x+9i)(x-9i)=(-x-9i)(x-9i)\to C.
User Johndeu
by
7.8k points
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