Q. 25.0( 2 Votes )

The expansion of A. x3 + 2x2 – 5x – 6

B. x3 – 2x2 + 5x – 6

C. x3 + 2x2 + 5x – 6

D. x3 + 2x2 + 5x + 6

Answer :

Using identity,


(x + a)(x + b)(x + c) = x3 + (a + b + c)x2 + (ab + bc + ca)x + abc


We have,


(x + 1)(x – 2)(x + 3) = x3 + (1 – 2 + 3)x2 + (– 2 – 6 + 3)x – 6


= x3 + 2x2 – 5x – 6

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