यदि x - 2, बहुपद x2 + ax + 2b का एक गुणनखण्ड हो एवं a + b = -2 हो तो a और b का मान होगा :  

1
a = -1, b = -3
2
a = 1, b = 3
3
a = -3, b = 1
4
a = 5, b = -3

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