At Westonci.ca, we connect you with the best answers from a community of experienced and knowledgeable individuals. Experience the convenience of getting accurate answers to your questions from a dedicated community of professionals. Get immediate and reliable solutions to your questions from a community of experienced professionals on our platform.

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

Sagot :

Giovi
I think C. (-x-9i)(x-9i)

You can multiply them to get:
(-x-9i)(x-9i)=[tex]- x^{2} +9xi-9xi+81 i^{2} [/tex]=
remembering that: [tex]i= \sqrt{-1} [/tex] so that:
[tex] i^{2} =-1[/tex]
Finally:
[tex]- x^{2}+81 i^{2} [/tex]=[tex]= -x^{2} -81[/tex]


Thanks for using our service. We're always here to provide accurate and up-to-date answers to all your queries. We appreciate your time. Please come back anytime for the latest information and answers to your questions. Find reliable answers at Westonci.ca. Visit us again for the latest updates and expert advice.