1.

If 2 and 1/2 are the zeros of px2+5x+r, then(a) p = r = 2(b) p = r = - 2(c) p = 2, r= -2(d) p = -2, r= 2

Answer»

Correct answer is: (b) p = r = - 2

Sum of zeroes = 2 + \(\cfrac{1}{2}\)= -5/p

i.e. 5/2 = -5/p . So p = -2

Product of zeroes = 2x 1/2 = r/p

i.e. r/p = 1 or r = p = -2



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