x = -1 হলে, x3 + 2x2 - 1 এর মান কোনটি?
Solution
Correct Answer: Option C
x3 + 2x2 - 1
= (-1)3 + 2.(-1)2 - 1
= - 1 + 2 - 1
= 2 - 2
= 0
= - 1 + 2 - 1
= 2 - 2
= 0
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