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Determine whether each expression is a polynomial?
1. f(x)= 3x+ 4/3(x^3) - 7
2. g(x)= -5x^3 + x- 3/x
3. h(x)= x^3 √5 + x-3
4. k(x)=25x^2-x^3+x^5
Please help me!!
1 Answer
- 6 years ago
1 and 4 are definitely polynomials. 2 isn't, because an expression isn't a polynomial if any term has x in the denominator. For 3, it IS one if the square root of five is the coefficient of x^3. But if the radical portion is part of the exponent, it isn't a polynomial because exponents must be whole numbers.