Question

evaluate (z2-4)(z2+1/4)

Answer 1

Answer:

z^4 - 15z^2/4 - 1

Step-by-step explanation:

= z^2(z^2 + 1/4) -

4(z^2 + 1/4)

= z^4 + z^2/4 - 4z^2 - 1

= z^4 + z^2 -16z^2 / 4 - 1

= z^4 - 15z^2/4 - 1