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Which term contains (p) in ( (4p-1)^2 )?

Answer and explanation

Correct answer: (-8p)

The direct answer is option B: -8p. Start with the identity (x - y)^2 = x^2 - 2xy + y^2. Here x = 4p and y = 1. Therefore, (4p - 1)^2 = (4p)^2 - 2(4p)(1) + 1^2 = 16p^2 - 8p + 1. The term containing p to the first power is -8p. Option A, 8p, has the wrong sign because the middle term of a subtraction square is negative. Option B, -8p, is correct because -2 multiplied by 4p and 1 gives -8p. Option C, 16p^2, is also part of the expansion, but it contains p squared, not p alone, so it is not the requested term. Option D, 1, is the constant term and contains no p. The important lesson is that the middle term is formed by multiplying twice the first part and the second part, with the sign between the parts retained. Memory cue: in (a - b)^2, remember square, minus double product, square.

Related tags

Middle TermNegative SignBinomial Square

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