if a pen costs rs. (3a-b)and if you buy a (3a+b)pens how much will you pay to the shoopkeeper​

2 thoughts on “if a pen costs rs. (3a-b)and if you buy a (3a+b)pens how much will you pay to the shoopkeeper​”

1. Step-by-step explanation:

   The velocity of an object is the rate of change of its position with respect to a frame of reference, and is a function of time. Velocity is equivalent to a specification of an object’s speed and direction of motion

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2. Answer:

   cost of 1 pen = (3a-b)

   cost of (3a+b) pens = (3a+b)(3a-b)

   [tex]so,(a+b)(a-b)=a^{2} -b^{2}[/tex]

   now appliying the identity

   [tex]so,(3a+b)(3a-b)\\(3a)^{2} -b^{2}\\9a^{2} -b^{2}[/tex]

   Step-by-step explanation:

   pls mark brainliest

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