Using and indirect proof prove that if n is an integer and 5n^2+ 19 is even, then n is

odd.

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- Jun 16th 2014, 11:49 PMBenja303Indirect Proof question
Using and indirect proof prove that if n is an integer and 5n^2+ 19 is even, then n is

odd. - Jun 17th 2014, 12:22 AMromsekRe: Indirect Proof question
- Jun 21st 2014, 05:29 AMHallsofIvyRe: Indirect Proof question
A little more detail: Suppose n were even. Then n= 2k for some integer k. . Since is equal to 2 times an integer plus one, it is odd, not even, a contradiction.