Question

9 Which of the following is the simplest form of the expression (3na+1)(2na)(−n−2a)?


a.
−6n

b.
−6na


c.
None of these


d.
−6na+1

Answer 1

Solution :-

→ (3n^a + 1) * (2n^a) * (-n)^(-2a)

using a^m * a^n = a^(m + n)

→ {6n^(2a) + 2n^a)} * (-n)^(-2a)

using a^(-m) = 1/a^m

→ (6n^(2a) + 2n^a) * (-1)/n^2a

→ {6n^(2a) / n^(2a)} - (2n^a/n^2a)

using a^m ÷ a^n = a^(m - n)

→ 6 - 2n^(a - 2a)

→ 6 - 2n^(-a)

(C) None of these is correct answer .

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