{xЄR | X squared>4}

{xЄR | x<0} ∩ {yЄR | y squared ≥25}

{xЄR | -5≤ x≤ 5} U {xЄR | x-10<30}

thanks

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- Mar 9th 2009, 09:40 PMb0mb3rzWrite the following sets using interval notation?
{xЄR | X squared>4}

{xЄR | x<0} ∩ {yЄR | y squared ≥25}

{xЄR | -5≤ x≤ 5} U {xЄR | x-10<30}

thanks - Mar 10th 2009, 02:13 AMearboth
$\displaystyle \{x \in \mathbb{R}|x^2>4\} = (-\infty, -2) \cup (2, +\infty)$

$\displaystyle \{x \in \mathbb{R}|x<0 \} \cap \{y \in \mathbb{R}|y^2\geq 25 \} = (-\infty, -5]$

$\displaystyle \{x \in \mathbb{R}|-5 \leq x \leq 5 \} \cup \{x \in \mathbb{R}|x-10 < 30 \} = [-5, 20)$

All your questions are quite straight forward, so I'm interested to know where you have had difficulties ... ? - Mar 10th 2009, 02:21 AMAnwar
- Mar 10th 2009, 03:15 AMb0mb3rz
yeah thanks,

i tried the questions before hand and got some right just wanted to make sure

first week at uni so not used to lectures and stuff