Q. 45.0( 1 Vote )

If (x – 1) divides mx3 – 2x2 + 25x – 26 without remainder find the value of m

Answer :

mx3 – 2x2 + 25x – 26 is divided by (x – 1) without remainder that means remainder = 0


Remainder theorem states that if p(x) is any polynomial and a is any real number and If p(x) is divided by the linear polynomial (x – a) , then the remainder is p(a).


Let p(x) mx3 – 2x2 + 25x – 26 and we have (x – 1)


The zero of (x – 1) is 1


Now using Remainder theorem,


p(x) = mx3 – 2x2 + 25x – 26 is divided by x – 1 then, p(1) is the remainder which is 0


p(1) = mx3 – 2x2 + 25x – 26 = 0


= m(1)3 – 2(1)2 + 25(1) – 26 = 0


= m – 2 + 25 – 26 = 0


= m – 3 = 0


m = 3


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