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1 solution
Good method, even better then the way I solved it!
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Yeah exactly, I didn't observe that both are always positive. @Kriti Kamal Upvoted
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@Mahdi Raza Have you solved new Pre RMO questions? (posted today)
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@Zakir Husain – Yes, both are nice. What is k equal to 510 or 420?I am confused by the discrepancy in the solutions
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@Mahdi Raza – k = 4 2 0 in A Pre-RMO question! -22
@Mahdi Raza thanks
I solved it the same way, but one note: zero is not positive, so the functions are not positive, they're greater than or equal to zero.
@Zakir Husain thanks
@Zakir Husain , @Mahdi Raza visit my find velocity problem
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I have visited it
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@Zakir Husain in solution i have given the condition for quadration function to be equation of distance . Please check it.
∣ x − 3 ∣ a n d x 2 − 9 both are positive .
∣ x − 3 ∣ = 0 which gives x =3
x 2 − 9 = 0 which gives x =3 or x=-3
So,common solution of x is 3
it can be also done by squaring both sides,but i want to depict an another method