Question

2+ 2+ z2–2–2z –2z, if =−3, =2, =−2

Answer 1

Answer:

Solution



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Correct option is A)

Given :- z2−2z+4=0 

z2+4=2x

Problem : ∑n=124(2nzn+zn2n)2

∑n=124((2z)nz2n+22n)2

We know (z2(1)+22(2))=2z(1)

(z2+22)=(2z)2

z4+24+2.z222=(2z)2

z4+24=24z2−8z2

8z

Step-by-step explanation:

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Solution



Verified by Toppr

Correct option is A)

Given :- z2−2z+4=0 

z2+4=2x

Problem : ∑n=124(2nzn+zn2n)2

∑n=124((2z)nz2n+22n)2

We know (z2(1)+22(2))=2z(1)

(z2+22)=(2z)2

z4+24+2.z222=(2z)2

z4+24=24z2−8z2

8z

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