The coefficient of ๐ฅ4 in the polynomial (๐ฅ โ 1)3(๐ฅ โ 2)3 is equal to ______
Question
The coefficient of ๐ฅ4 in the polynomial (๐ฅ โ 1)3(๐ฅ โ 2)3 is equal to ______
Solution
To find the coefficient of ๐ฅ4 in the polynomial (๐ฅ โ 1)3(๐ฅ โ 2)3, we can expand the polynomial using the binomial theorem.
First, let's expand (๐ฅ โ 1)3. Using the binomial theorem, we have:
(๐ฅ โ 1)3 = ๐ฅ3 - 3๐ฅ2 + 3๐ฅ - 1
Next, let's expand (๐ฅ โ 2)3. Again, using the binomial theorem, we have:
(๐ฅ โ 2)3 = ๐ฅ3 - 3๐ฅ2 + 3๐ฅ - 8
Now, to find the coefficient of ๐ฅ4, we need to multiply the terms that have ๐ฅ4 in them. In this case, we have ๐ฅ3 from (๐ฅ โ 1)3 and ๐ฅ from (๐ฅ โ 2)3.
Multiplying ๐ฅ3 and ๐ฅ, we get ๐ฅ4.
Therefore, the coefficient of ๐ฅ4 in the polynomial (๐ฅ โ 1)3(๐ฅ โ 2)3 is 1.
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