Question

plz solved this questions

Answer 1

1,2,4,7 are polynomial.
polynomial have powers in whole numbers,not negative and rational and irrational numbers.
1)
$8 = 8 {x}^{0}$
it is a polynomial.
2)
$\sqrt{3} {x}^{2} - 2x$
here x has positive degree or powers,so it is a polynomial.
4)
$\frac{1}{5 {x}^{ - 2} } + 5x + 7 \\ = \frac{ {x}^{2} }{5} + 5x + 7$
so it is a valid polynomial.
7)
$\frac{1}{7} {a}^{3} - \frac{2}{ \sqrt{3} } {a}^{2} + 4a - 7$
all the powers of a are positive,so it is a valid polynomial.
remaining else does not follow the rules,so they are invalid