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Is (4x^2-5|x|+8) a polynomial or not?

Answer and explanation

Correct answer: No because (|x|) is not a polynomial term

The correct answer is C: 4x^2-5|x|+8 is not a polynomial. In a polynomial, every variable term must use a non-negative integer power of x. The terms 4x^2 and 8 are acceptable, but |x| is not a power such as x^0, x^1, x^2, and so on. It is a modulus expression, whose rule changes according to whether x is positive or negative, so it is not a polynomial term in the Grade 9 definition. Option A is wrong because having x^2 does not repair another invalid term. Option B is wrong because a constant may occur in a non-polynomial expression too. Option C is correct. Option D is wrong because the number of terms does not decide whether an expression is a polynomial. Memory cue: check every term, not just one attractive term.

Related tags

PolynomialAbsolute ValueNon Polynomial

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