The cost of a pen is rs. (x+4) and rohit boigjt (x+4) pens. The total amount paid by him is.?
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(x+4)(x+4)
=x^2 + 16 + 8x (Using (a+b)^2 identity)
=x^2 + 16 + 8x (Using (a+b)^2 identity)
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