1. Show that 21*18^(2x)+36*7^(3x) is divisible by 19 for all positive integers x

2. Find all pairs of odd integers m and n which satisfy the following equation:

m+128n=3mn

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- Jun 1st 2012, 04:17 AMsomeoneanonymousTwo algebra problems? Yes I am a little stupid and even if you can do one, that's ok!
1. Show that 21*18^(2x)+36*7^(3x) is divisible by 19 for all positive integers x

2. Find all pairs of odd integers m and n which satisfy the following equation:

m+128n=3mn - Jun 1st 2012, 06:52 AMSorobanRe: Two algebra problems? Yes I am a little stupid and even if you can do one, that's
Hello, someoneanonymous!

Quote:

We have: .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

. . . . . .

Therefore, is divisible by 19.