The coefficient of x² in the expansion of (x+3)² is *
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Answer:
The coefficient of x² is -6.
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Answer:
(x+3)^2
(apply the formula (a+b)^2= a^2 + 2ab + b^2 )
(x+3) ^2 = x^2 + 2×x×3 + 3^2
= x^2 + 6x + 9
cosfficient of x^2 = 1
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