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WILL MARK FIRST PERSON WITH THE RIGHT ANSWER AS BRAINIEST

If $a$, $b$, $c$, and $d$ are replaced by four distinct digits from $1$ to $9$, inclusive, then what's the largest possible value of the difference $a.b - c.d$ ?

The units digits matter most, so we make a as large as possible (a=9) and make c as small as possible (c=1). Then we can use any of the digits from 2 through 8. We still want b as large as possible and d as small as possible so we set b=8 and d=2. This gives a maximum possible difference of 9.8 - 1.2 = 8.6.

I hope this helped!

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URGENT!!! WILL MARK FIRST PERSON WITH THE RIGHT ANSWER AS BRAINIEST If $a$, $b$, $c$, and $d$ are replaced by four distinct digits from $1$ to $9$, inclusive, then what's the largest possible value of the difference $a.b - c.d$ ?

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URGENT!!!

WILL MARK FIRST PERSON WITH THE RIGHT ANSWER AS BRAINIEST

If $a$, $b$, $c$, and $d$ are replaced by four distinct digits from $1$ to $9$, inclusive, then what's the largest possible value of the difference $a.b - c.d$ ?