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If (p(x)=8x-5) and (q(x)=3x+11), what is (2p(x)-5q(x))?

Answer and explanation

Correct answer: x-65

Here, 2p(x)=2(8x-5)=16x-10 and 5q(x)=5(3x+11)=15x+55. Therefore, 2p(x)-5q(x)=(16x-10)-(15x+55)=16x-10-15x-55=x-65. The option x+45 results from not applying the negative sign correctly to the constant term of q(x). Exam tip: When subtracting a bracket, change the sign of every term inside it.

Related tags

PolynomialsLinear PolynomialsAlgebraic ExpressionsLike TermsSubtraction Of PolynomialsIntroduction To PolynomialsMathematicsClass 9 Mcq

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