Question

please help me with this question by explaining step by step please by explanation​

Answer 1

Soln:-

option (3),

coefficient of x² = 189

Formula:-

(a+b)³ = a³+b³+3(3x)(7)(3x+7)

(3x+7)³ = 27x³+343+63x(3x+7)

= 27x³+343+189x²+441x

Then coefficient of x² = 189

Answer 2

Answer:

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