Q. 3 D

# Using algebraic i

Answer :

(5x + 2)(1 – 5x)(5x + 3)

Here we have to use the identity

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

– (5x + 2)(5x – 1)(5x + 3)

here x = 5x, a = 2, b = – 1 and c = 3

= – (5x)3 – (2 – 1 + 3)(5x)2 – (– 2 – 3 + 6)5x + 6

= – 125x3 – 100x2 – 5x + 6

Here coefficient of

x2 = – 100

x = – 5 and

constant term = 6

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