Hi! ⋇
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The first digit of this number is 3², which is 9.
The Number is : 9xx
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The second digit is: -2·(-4)=8.
The Number is : 98x.
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The sum of all the digits is 18. This gives us an equation that we can solve in terms of x!
[tex]\multimap\sf{9+8+x=18}[/tex] (x is the digit we are looking for)
Now it takes a little arithmetic to find x :)
[tex]\multimap\sf{17+x=18}[/tex]. Just subtract 17 from both sides to find x!
[tex]\multimap\sf{x=1}[/tex]. And Now, can you see the number!
It's 981, of course :)
Hope this made sense to you!
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[tex]\large\it{\overbrace{Calligrxphy}}[/tex]
