Question

proove that n^2+n is an even number

Answer 1

Factor it first...

Answer 2

U get n(n+1) ie 2 consecutive numbers..
Can you do it now?

Answer 3

thanks, ill try :)

Answer 4

Im still not sure .. do i prove by contradiction ? if so ,how ?

Answer 5

what's true of the product of an even and an odd number?

Answer 6

it's always.......?

Answer 7

2 consecutive numbers must be
odd even OR
even odd
Either way, you multiplying odd by even

Answer 8

Ohh of course, thanks :)

Answer 9

ur welcome