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11-08-2018
Mathematics

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Which of the following expressions is equal to -4x^2-36? A. (-4x-12i)(x+3) B. (-4x+9i)(x-4i) C. (-4x+12i)(x+3i) D. (-4x-9i)(x-4i)

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13-08-2018

[tex] (-4x+12i)(x+3i)=(-4x)(x)+(-4x)(3i)+(12i)(x)+(12i)(3i)\\\\=-4x^2-12ix+12ix+36i^2=-4x^2-36\\\\Answer:\ C. [/tex]

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