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12 December, 08:50

Which expression is equivalent to16x2+81?

1.

(4x-9i) 2

2.

(4x+9i) (2x+3i) (2x-3i)

3.

(4x+9i) (4x-9i)

4.

(4x+9i) 2

+4
Answers (1)
  1. 12 December, 09:03
    0
    16*X² + 81

    The answer is 3

    (4x+9i) (4x-9i) = (4x+9i) * 4x - 9i ((4x+9i)) = 16x2 + 36i - 36i - 81i2 = 16x² - 81 (-1)

    = 16x² + 81
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