Question

the cofficient of x² in (3x+7)³​

Answer 1

Answer:

3 is the cofficient of x

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

(3x+7)^2 = 9x^2+42x+49        (a+b)^2=a^2+2ab+b^2

so co efficient of x^2 = 9