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What is obtained after simplifying (4x^2-7x+6-(2x^2-5x-3))?

Answer and explanation

Correct answer: (2x^2-2x+9)

When a whole polynomial is subtracted, the minus sign must be distributed to every term inside its brackets. Starting with \(4x^2-7x+6-(2x^2-5x-3)\), change the signs in the second bracket: \(-(2x^2-5x-3)=-2x^2+5x+3\). The expression becomes \(4x^2-7x+6-2x^2+5x+3\).

Now combine like terms. The quadratic terms give \(4x^2-2x^2=2x^2\), the linear terms give \(-7x+5x=-2x\), and the constants give \(6+3=9\). Hence the simplified expression is \(2x^2-2x+9\), which is option A. Options B and C result from failing to combine or change signs correctly, while option D has the wrong sign for the linear term. The supplied answer and explanation are correct.

Related tags

Algebraic-ExpressionsBracketsSimplification

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