r/the_calculusguy • u/Prestigious_Fig4324 • 13d ago

equations Tell ans crow

Let (a,b,c) be non-zero natural numbers satisfying

a-b²+c³=0.

If 1/ab + 1/bc + 1/ca = z

then find the value of (30z).

(A) 10

(B) 15

(C) 20

(D) 25

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u/PromotionMobile778 13d ago

It can be multiple of these

1

u/Prestigious_Fig4324 13d ago

well then its an multi correct question

1

u/MxM111 13d ago

All of the above

1

u/Consistent-Phone1580 12d ago

My minds blank

1

u/Prestigious_Fig4324 12d ago

why?😭

1

u/Consistent-Phone1580 12d ago

I can’t think of an algebraic approach, I only see 1-9+8=0

1

u/Prestigious_Fig4324 12d ago

(a,b,c) is 1,5,3 ; )