Multiple Choice Questions

The expression 2x3 x2 ndash 2x ndash 1 is divisible by ........

Quantitative Aptitude (RRB NTPC) Algebra

The expression 2x³ + x² – 2x – 1 is divisible by

x + 2

2x + 1

x – 2

2x – 1

Let f(x) = 2x³ + x² – 2x – 1
= x²(2x + 1) – 1(2x + 1)
= (x² – 1)(2x + 1)
= (2x + 1)(x + 1)(x – 1)

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