# square roots. stuck!!!

• Feb 2nd 2009, 08:29 AM
andyboy179
square roots. stuck!!!
Attachment 9961 those are the questions which i need help on. the first on i need to find the number which goes up the top and the rest i need to know what the answers are- but could u please explain it. thanks
• Feb 2nd 2009, 08:38 AM
Re :
(1) $\sqrt{8}=2.8282828$

(2) $\sqrt[3]{64}=4$

(3) $\sqrt[3]{-1}=-1$
• Feb 2nd 2009, 08:41 AM
andyboy179
Quote:

(1) $\sqrt{8}=2.8282828$

(2) $\sqrt[3]{64}=4$

(3) $\sqrt[3]{-1}=-1$

how do i work it out???
• Feb 2nd 2009, 08:45 AM
joserizal
2.8282 * 2.8282 = 7.97.... also equals to 8
4 * 4 * 4 = 64
-1 * -1 * -1 = -1
• Feb 2nd 2009, 08:47 AM
andyboy179
i understand now thanks alot mate
• Feb 2nd 2009, 08:51 AM
joserizal
no problem you just multiply the answer with the itself depending on the root. (Evilgrin)
• Feb 2nd 2009, 10:36 AM
masters
Quote:

(1) $\sqrt{8}=2.8282828$
$\sqrt{8} \approx 2.828427125$ or in simplest radical form as $\sqrt{4 \cdot 2}=2\sqrt{2}$