square roots. stuck!!!

**andyboy179** · February 2nd 2009, 07:29 AM

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

**mathaddict** · February 2nd 2009, 07:38 AM

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

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

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

**andyboy179** · February 2nd 2009, 07:41 AM

Originally Posted by mathaddict

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

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

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

how do i work it out???

**joserizal** · February 2nd 2009, 07:45 AM

2.8282 * 2.8282 = 7.97.... also equals to 8
4 * 4 * 4 = 64
-1 * -1 * -1 = -1

**andyboy179** · February 2nd 2009, 07:47 AM

i understand now thanks alot mate

**joserizal** · February 2nd 2009, 07:51 AM

no problem you just multiply the answer with the itself depending on the root.

**masters** · February 2nd 2009, 09:36 AM

Originally Posted by mathaddict

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

Not quite.

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

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