If A=[ 3
1
-1
2
], find f(A), where f(x)=x 2
−5x+7.
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Answer:
Given that
A=[3,1,-1,2]
and f(x)=x^2-5x+7
if A =3 then
f(3)=(3^2)-5*3+7
=9-15+7
=1
again A=1 then
f(1)=(1^2)-5*1+7
=2-5+7
=4
again A=-1 then
f(-1)=(-1^2)-5*(-1)+7
=1+5+7
=13
again A=2 then
f(2)= (2^2)-5*2+7
=4-10+7
=1
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