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If the simplified form of ((2k+1)x-4x) is (9x), what is the value of (k)?

Answer and explanation

Correct answer: 6

displaystyle (2k+1)x-4x=[(2k+1)-4]x=(2k-3)x. Since its simplified form is 9x, the coefficients of x must be equal: 2k-3=9. Thus, 2k=12 and k=6. For example, choosing 5 gives coefficient 7, not 9. Exam tip: while combining like terms, add or subtract their coefficients only.

Related tags

Algebraic ExpressionsLike TermsCoefficientsLinear EquationsPolynomialsIntroduction To PolynomialsMathematicsClass 9 Mcq

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