Q16 of 30 Page 36

If 2 and 3 are zeroes of polynomial 3x2 – 2kx + 2m. Find the value of k and m.

As 2 and 3 are zeroes of equation 3x2 – 2kx + 2m we will get 0 when we substitute x by 2 and 3


Let us substitute x = 2


3(2)2 – 2k(2) + 2m = 0


12 – 4k + 2m = 0


Divide whole equation by 2


6 – 2k + m = 0


m = 2k – 6 …(i)


Now substitute x = 3


3(3)2 – 2k(3) + 2m = 0


27 – 6k + 2m = 0


Substitute value of m from equation (i)


27 – 6k + 2(2k – 6) = 0


27 – 6k + 4k – 12 = 0


15 – 2k = 0


2k = 15



Put value of k in (i)



m = 15 – 6


m = 9


Hence and m = 9


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