Question

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Answer 1

Answer:

27x³ + 343+ 189x² + 69x

the coefficient of x² is 189

Step-by-step explanation:

by taking (a+b)³= a³+b³+3a²b+3ab²

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Answer 2

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