1.

the polynomial ax^3+3x^2-13 and 2x^3-5x+a when divided by x+2.if the remainder in each case is the same find the value of a

Answer»

If a NUMBER 'a' and a number 'b' are DIVISIBLE by a number 'N' then, a+b and a-b is also divisible by n

=> let the number be n which divides 62, 132 and 237 leaving a reminder r

=> the REQUIRED number then becomes H.C.F of 62-r, 132-r and 237-r

=> it could also be the H.C.F of 
(132-r)-(62-r) and (237-r)-(132-r)

i.e. 70 and 105

=> H.C.F of 70 and 105 = 35

the required number n is 35.


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