anonymous
  • anonymous
Which of the following are polynomials.
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
\[A) x^5+x-\frac{ 1 }{ 4 } B)-4c^2-\frac{ 5 }{ c } C)5y+\sqrt{y}+7 D) -2t^4-6t+\]
anonymous
  • anonymous
anonymous
  • anonymous

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anonymous
  • anonymous
I cheated and went to wikipedia but the definition is good "a polynomial is an expression of finite length constructed from variables (also called indeterminates) and constants, using only the operations of addition, subtraction, multiplication, and non-negative integer exponents." pay particular attention to the the very last qualifier of the quote
anonymous
  • anonymous
anonymous
  • anonymous
Which exponents are not integers in the expressions you listed?
anonymous
  • anonymous
A & B?
anonymous
  • anonymous
in a) the exponents on you x variable are 5, and 1. both integers in b) the exponents on the c variable are 2, -1. both integers, but one negative. this does not fit the description of a polynomial
anonymous
  • anonymous
identify the exponents in c) and d)
anonymous
  • anonymous
So A is one and C?
anonymous
  • anonymous
So,A,C,D
anonymous
  • anonymous
A & D
anonymous
  • anonymous
right, the exponent of a square root is 1/2, not an integer
anonymous
  • anonymous
thank you
anonymous
  • anonymous
while the exponents in d) areall positive and integers

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