Question

How do i know the negation is true or false?
I did the negation and symbolic form

Answer 1

@mhchen

Answer 2

I am having trouble determining if its false or true

Answer 3

Careful, it went from
5x + 3 = 7
to
5x + 7 = 7

They aren't the same
The second one doesn't seem to be false.
\[\neg (\exists x \in A)[P(x)] = (\forall x \in A) \neg [P(x)] \]

Answer 4

oh okay, then it must be true for that one

Answer 5

how about this one.

Answer 6

@mhchen

Answer 7

Yeah looks right

Answer 8

ty ;o