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Which option gives the correct result of subtracting (2x^2-7x-6) from (5x^2-3x+8)?

Answer and explanation

Correct answer: \(3x^2+4x+14\)

To subtract, change the sign of every term in the second expression: \((5x^2-3x+8)-(2x^2-7x-6)=5x^2-3x+8-2x^2+7x+6\). Combining like terms gives \(3x^2+4x+14\). Therefore, option A is correct. In option C, the sign of \(-7x\) has not been changed to \(+7x\). Exam tip: When a minus sign appears before brackets, reverse the signs of all terms inside the brackets.

Related tags

Polynomial SubtractionAlgebraic ExpressionsLike TermsSign ChangeClass 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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