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What is obtained by subtracting (7x^2-9x+10) from (12x^2-5x+4)?

Answer and explanation

Correct answer: \(5x^2+4x-6\)

While subtracting the second polynomial, the sign of every term in it changes: \((12x^2-5x+4)-(7x^2-9x+10)=12x^2-5x+4-7x^2+9x-10\). Combining like terms gives \(5x^2+4x-6\). In option C, the \(-9x\) term has not been correctly changed to \(+9x\) during subtraction. Exam tip: when a minus sign precedes brackets, reverse every sign inside the brackets.

Related tags

PolynomialsAlgebraic ExpressionsPolynomial SubtractionLike TermsClass 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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