the difference of two numbers is 84. find the numbers such that their product is a minimum.

the numbers are?
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2 Answers

y=x+84

want min av xy=x^2+84x

take dy/dx=2x +84

wen derivativ=0, yu get zero slope=max or min

(2x+84)=0 or x+42=0

x=-42

at this x, x^2=1764 & 84*x=-3528...

sum=-1764
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The difference of the first two digits is less than 4
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