Question

evaluate (z²+4) (z²-¼)

Answer 1

Refer to the attachment.

Answer 2

(z²+4)(z²-1/4)

=z²(z²-1/4)+4(z²-1/4)

=z⁴-z²/4z²+4z²/1-4/4

=z⁴-z²+16z²/4z²-1

=z⁴-15z²/4z²-1

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