1.

Find the value of a, if x – a is a factor of x3 – ax2 + 2x + a – 1.

Answer»

Let p(x) = x3 – ax2 + 2x + a – 1 

Since x – a is a factor of p(x), so p(a) = 0. 

i.e., a3 – a(a)2 + 2a + a – 1 = 0 

a3 – a3 + 2a + a – 1 = 0 

3a = 1 

Therefore, a = 1/3



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