Question:
Which of the following is quadratic polynomial?
(a) $x+4$
(b) $x^{3}+x$
(c) $x^{3}+2 x+6$
(d) $x^{2}+5 x+4$
Solution:
(d) $x^{2}+5 x+4$
$x^{2}+5 x+4$ is a polynomial of degree 2 . So, it is a quadratic polynomial.
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