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If the degree of (p(x)) is (5) and the degree of (q(x)) is (2), what is the degree of non-zero (p(x)q(x))?

Answer and explanation

Correct answer: (7)

The direct answer is option C, 7. For non-zero polynomials, the degree of a product equals the sum of the degrees. Let the leading terms be \\(ax^5\\) and \\(bx^2\\), with a and b non-zero. Their product begins with \\(abx^7\\), and ab is non-zero, so the degree is 7. Thus \\(\\deg(pq)=5+2=7\\), making option C correct. Option A, 3, could result from subtracting the degrees, but subtraction is not the rule for multiplication. Option B, 5, is only the degree of p and leaves q out. Option D, 10, comes from multiplying 5 and 2; degree multiplication is not used here. The wording says the product is non-zero, which removes any concern about a zero polynomial. Exam cue: for a product of non-zero polynomials, add the highest powers.

Related tags

DegreeProductPolynomial

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