3 years ago

Which of these represents a quadratic polynomial with exactly two zeros given by - 21 and 2i?

Mathematics

2 answers:

weqwewe [10]3 years ago

8 0

Answer:

B. x² + 4

Step-by-step explanation:

(0+/-√-16)2

+/- 4i / 2

+/- 2i

spin [16.1K]3 years ago

8 0

Answer:

Step-by-step explanation:

(x + 2i)(x - 2i)

= x² - 2ix + 2ix - (2i)²

= x² - 4i²

= x² -4(-1)

= x² + 4

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