Question

the coefficient of x^2 inthe expansion is (x+3)^4 is ​

Answer 1

Answer:

$({x + 3})^{4} \\ ( { {x}^{2} + 9 + 6x })^{2} \\ {x}^{4} + 9 {x}^{2} + {6x}^{3} + {9x}^{2} \\ + 81 + 54x + {6x}^{3} + 54x + {36 }^{2} \\ = {x}^{4} + 18 {x}^{2} .................. \\ so \: answer \: is \: 18$

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