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Question

Which of the following is/are polynomial functions?

A
g(x)=(1+2x)(x+4x)
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B
p(x)=5x2+x+1
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C
f(x)=(x+1)(x+2)(x1)(x2)
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D
h(x)=x3+(ee+1)x2(ln6)x
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Solution

The correct option is D h(x)=x3+(ee+1)x2(ln6)x
Polynomial functions are defined by
F(x)=a0xn+a1xn1+a2xn2++an1x+an
where aiR, nW, a00, xR
And the degree of f(x) will be n.

We have
f(x)=(x+1)(x+2)(x1)(x2)
f(x)=x43x2+2
Which is a polynimal function.

Taking,
g(x)=(1+2x)(x+4x)
g(x)=(1+2x)(x+4x1)
Since 1W, So it is not a polynomial.

Consider,
h(x)=x3+(ee+1)x2(log106)x+27
we can clearly observe that all the coefficients are real numbers and powers of variable x are whole number.
Hence it is a polynomial.

Also, p(x)=5x2+x+1
Obviously not a polynimial function, since it's an exponential function.

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