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# Need Some Help

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Which expressions are polynomials?

Select each correct answer.

30y^2+x

30y^2+x^1/2

(30y^2)/x

30y^2

Aug 30, 2018

### 2+0 Answers

#1
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30y2 + x    This is a polynomial.

30y2 + x1/2    If this your expression, it is not a polynomial because the exponent of x is a fraction.

(30y2)/x    This is not a polynomial because  x  is in the denominator.

30y2    This is a polynomial.

Also, this might help you:  https://www.mathsisfun.com/definitions/polynomial.html

Aug 30, 2018
#2
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A polynomial cannot  fractional exponents associated with any variable.....so the second one  is out

Also....

(30y^2 ) / x  =   30y^2 x^-1....and a polynomial cannot have negative exponents associated wiith any variable

So....

The first and last answers are  correct...[ only non-negative  non-fractional exponents are allowed ]   Aug 30, 2018