1.

Product of pragati age2 yrs ago and 3 years hence is 84. Find her presents age

Answer» PRESENT age be x
ACC to equation
(x-2)(x+3)=84
x²+x-6=84
x²+x-90=0
x²+10x-9x-90
(x+10)(x-9)=0
either x=-10 or x=9
Age cannot be negative THEREFORE present age is 9 years


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