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After simplifying (x^4(x^5-3x)-x^9+6x^6-2), what is the degree?

Answer and explanation

Correct answer: (6)

The expression must first be expanded and like terms must then be combined. Multiplying \(x^4\) by each term inside the bracket gives \(x^4\cdot x^5=x^9\) and \(x^4(-3x)=-3x^5\). Therefore the full expression becomes \(x^9-3x^5-x^9+6x^6-2\). The two terms with power 9 have opposite coefficients and cancel completely.

After cancellation, the expression is \(6x^6-3x^5-2\). The highest remaining exponent is 6, and its coefficient 6 is nonzero, so the degree is 6. Hence option B is correct. Choosing 9 would ignore the cancellation; this is why simplifying before deciding the degree is essential.

Related tags

PolynomialExpansionCancellation

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