alleryStart learning →In the expansion of (2x+k)(x−3), the x term vanishes. What is k?
A6
B−6
C3
D−3
Answer & Solution
Correct answer: A. 6
The x coefficient is k − 6, so it vanishes when k = 6.
Keep practising Algebraic Expressions and Identities
Browse all Algebraic Expressions and Identities questions for ICSE Class 8, or explore more Mathematics topics.
Related questions
Combine a binomial square and a conjugate product: (a+b)²−2ab−(a−b)(a+b).A rectangle's sides change from x,y to x+2,y−3, where x>0,y>3. New area minus old?Use both identities to reduce (x+1)(x−1)−(x−2)².For real a,b, (a+b)²=49 and (a−b)²=9. Determine their product.A square frame has outer side a+2 cm and inner side a cm, with a>0. What is its border areFor every real x, what is the value of (x+1)² − x(x+2)?Subtract the two expanded products: (x+2)(x+5)−(x+2)(x+3).What is the coefficient of xy in (2x + 3y)²?