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What is obtained after simplifying (3x^2-2x+7-(x^2+5x-4))?

Answer and explanation

Correct answer: (2x^2-7x+11)

When a whole bracket is subtracted, the minus sign must be applied to every term inside that bracket. Thus \\(-(x^2+5x-4)=-x^2-5x+4\\). The expression becomes \\(3x^2-2x+7-x^2-5x+4\\). Now combine like terms: \\(3x^2-x^2=2x^2\\), \\(-2x-5x=-7x\\), and \\(7+4=11\\).

Hence the simplified expression is \\(2x^2-7x+11\\), so option B is correct. The most common error is to change the sign of only the first term in the bracket. Since the subtraction applies to the entire bracket, every sign inside changes. Option A would result from mishandling the signs of the linear and constant terms.

Related tags

Algebraic-ExpressionsBracketsSimplification

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