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Using the given zero, find all other zeros of f(x). -2i is a zero of f(x) = x^4 - 45x^2 - 196 a) 2i, 14i, -14i b) 2i, 7, -7 c) 2i, 14, -14 d) 2i, 7i, -71
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Using the given zero, find all other zeros of f(x). -2i is a zero of f(x) = x^4 - 45x^2 - 196 a) 2i, 14i, -14i b) 2i, 7, -7 c) 2i, 14, -14 d) 2i, 7i, -71
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Using the given zero, find all other zeros of f(x).
-2i is a zero of f(x) = x^4 - 45x^2 - 196
a) 2i, 14i, -14i
b) 2i, 7, -7
c) 2i, 14, -14
d) 2i, 7i, -71
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hello :
answer : a
because : f(2i) = (2i)^4 -45(2i)² -196 = 16(1)-45(-4)-196...... ( i²=-1)
= 16+180 -196 =196-196 =0
same solution : f(14i)=f(-14i)=0
Ilia Barahovsky
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Jul 24, 2018
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Ilia Barahovsky
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