Answer :

Let age of one friend be x and another friend be (20 – x) so that their sum is 20


Age four years ago


Age of one friend would have been (x – 4) and another friend would have been (20 – x – 4) which is (16 – x)


Given that four years ago the product of their ages was 48


(x – 4)(16 – x) = 48


16x – x2 – 64 + 4x = 48


– x2 – 64 + 20x = 48


x2 + 64 – 20x + 48 = 0


x2 – 20x + 112 = 0


Comparing equation x2 – 20x + 112 = 0 with ax2 + bx + c = 0 we get


a = 1, b = – 20 and c = 112


Discriminant (D) = b2 – 4ac


D = (– 20)2 – 4(1)(112)


D = 400 – 448


D = –48


D<0 which means no real values of x


As no real values of x the equation which we formed using given statements cannot be true


Hence the statements cannot be true


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