Nirvana123 Nirvana123

13-06-2018
Mathematics

contestada

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)

Respuesta :

04-07-2018

[tex]-x^2-81=-(x^2+81)=-(x^2-(9i)^2)=-(x+9i)(x-9i)=(-x-9i)(x-9i)\to C.[/tex]

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