1.

If the sum of the zeroes of the quadratic polynomial f(x) = kx2 + 7x - 5 is 14, then the value of k is

Answer»

Let the zeroes be a and b 

So, given a + b = 14 .....(1) 

Now, 

kx2 + 7x - 5 

x = k, y = 7, z = -5 

From (1), 

a + b = 14

-y/x  = 14

-7/k = 14

14k = -7

k = -7/14

k = -1/2



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