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Answer»

The general term of the expansion is

15Cr *(x²)^(15-r) × (3/x)^r

so, for power on x to be 18.

x^(2*15-2r). x^-(r) = x^18=> x^(30-3r) = x^18=> 30 -3r = 18=> 3r = 12 => r = 4

so, term will be 15C4. x^22. 3⁴/x⁴= (15C4)(81)x^18



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