Which of the following is a quadratic polynomial ?
(a) $x + 4$
(b) $x^{3} + x$
(c) $x^{3} + 2 x + 6$
(d) $x^{2} + 5 x + 4$

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Solution

ANSWER:
(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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