How smart is /g/?

>snot-nosed runt posting his 3rd grade math homework
fucking STATE of /g/

>>>/sci/

>>61582281
Who has homework in the summer?

>>61582348
kids dumb enough to need remedial classes

>>61582348
3rd grade for me was year round school, we just got like a week off school every month or something

2j^2 will always be even
3j is even if j is even
3j is odd if j is odd
even plus an even is even
odd plus an odd is odd
even plus an odd is odd
even minus odd minus odd is odd
even minus even minus odd is even
i can't be assed to be more formal than that

>>61582348
Most kids these days.

>>61582216
2 x (2 x 2) = 8 - 6 - 5 = -3

J = 2

did I win

>>61582404
>odd plus an odd is odd
>even minus odd minus odd is odd
>even minus even minus odd is even

>>61582404
>assuming that 5 is always odd

if j is odd, then j=2k+1 for some integer k. 2(2k+1)^2-3(2k+1)-5=2(k(4k+1)-3) is even

2x^2 - 3x -5 mod 2 = 1 implies x mod 2 = 0

-> 2x^2 - 3x mod 2 = 1 + 5 mod 2 = 0
-> 2x^2 mod 2 = 3x mod 2
-> 2 mod 2 * x^2 mod 2 = 3 mod 2 * x mod 2
-> 0 * x^2 mod 2 = 1 * x mod 2

Which is only true for x = 0, i.e. x is even.