# Need urgent help

• Apr 1st 2009, 04:14 AM
THAT MAN
Need urgent help
i have no idea what these mean:
http://img22.imageshack.us/img22/8144/assignment2.jpg

but does anyone know how to solve it? if so could i please have the answers and how you solved it?

thankyou.
• Apr 1st 2009, 06:21 AM
CaptainBlack
Quote:

Originally Posted by THAT MAN
i have no idea what these mean:
http://img22.imageshack.us/img22/8144/assignment2.jpg

but does anyone know how to solve it? if so could i please have the answers and how you solved it?

thankyou.

image attached

CB
• Apr 1st 2009, 08:45 PM
CaptainBlack
Quote:

Originally Posted by THAT MAN
i have no idea what these mean:
http://img22.imageshack.us/img22/8144/assignment2.jpg

but does anyone know how to solve it? if so could i please have the answers and how you solved it?

thankyou.

5(i) asks for the truth value of:

\$\displaystyle \forall x: \ 3-x^2 \le 9\$

Now \$\displaystyle x^2\$ is always greater than or equal zero and has a minimum when \$\displaystyle x=0\$, so \$\displaystyle 3-x^2\$ has a maximum when \$\displaystyle x=0\$ and there it takes the value \$\displaystyle 3 \le 9\$ so the statement is true.

CB