Given: n=3; 4 and 2i are zeros; f(-1)=75 Find an nth-degree poly

Cabiolab

Cabiolab

Answered question

2021-09-17

Given:
n=3;
4 and 2i are zeros;
f(-1)=75
Find an nth-degree polynomial function with real coefficients

Answer & Explanation

Elberte

Elberte

Skilled2021-09-18Added 95 answers

f(x)=a(x4)(x2i)(x+2i)
f(x)=a(x4)(x22ix+2ix+4)
f(x)=a(x4)(x2+4)
f(x)=a[x2(x4)+4(x4)]
f(x)=a(x34x2+4x16)
Use f(1)=75 to solve for a:
75=a[(1)34(1)2+4(1)16]
-75=-25a
a=3
f(x)=3x312x2+12x48

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