The cost of a notebook is Rs -3 a 2-4 ab -6 b 2- How much would 5 a 2 b 2 notebooks cost-A- R s - 15 a4 b2-20 a3 b3-30 a2 b4B- R s - 15 a4 b2-20 a3 b3-30 a2 b4C- R s - 15 a4 b2-20 a3 b3-30 a2 b4D- R s - 15 a4 b2-20 a3 b3-30 a2 b4

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Standard VIII

Mathematics

Factorisation by Common Factors

The cost of a...

Question

The cost of a notebook is $R s . 3 a^{2} - 4 a b + 6 b^{2}$ . How much would $5 a^{2} b^{2}$ notebooks cost?

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Solution

The correct option is A
Cost of one notebook = $(3 a^{2} - 4 a b + 6 b^{2})$
Number of books = $5 a^{2} b^{2}$
Required amount = $(5 a^{2} b^{2}) \times (3 a^{2} - 4 a b + 6 b^{2})$
= $15 a^{4} b^{2} - 20 a^{3} b^{3} + 30 a^{2} b^{4}$

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The cost of a notebook is Rs.3a2−4ab+6b2. How much would 5a2b2 notebooks cost?

The correct option is A Cost of one notebook = (3a2−4ab+6b2) Number of books = 5a2b2 Required amount = (5a2b2)×(3a2−4ab+6b2) = 15a4b2−20a3b3+30a2b4

The cost of a notebook is $R s . 3 a^{2} - 4 a b + 6 b^{2}$ . How much would $5 a^{2} b^{2}$ notebooks cost?

The correct option is A
Cost of one notebook = $(3 a^{2} - 4 a b + 6 b^{2})$
Number of books = $5 a^{2} b^{2}$
Required amount = $(5 a^{2} b^{2}) \times (3 a^{2} - 4 a b + 6 b^{2})$
= $15 a^{4} b^{2} - 20 a^{3} b^{3} + 30 a^{2} b^{4}$