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After simplifying (2x^5(x^3-1)-2x^8+7x^4), what is the degree?

Answer and explanation

Correct answer: (5)

When an expression contains brackets, it must first be expanded and like terms must then be combined. This is essential because the terms with the greatest visible powers may cancel. The degree is determined only after all such cancellation has been completed.

Distribute \(2x^5\): \(2x^5(x^3-1)=2x^8-2x^5\). The full expression becomes \(2x^8-2x^5-2x^8+7x^4\). The two degree-8 terms cancel because their coefficients are 2 and \(-2\). The remaining expression is \(-2x^5+7x^4\), whose highest exponent is 5. Therefore choice B, (5), is correct.

Related tags

PolynomialExpansionCancellation

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