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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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Answered by
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
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