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
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(1) $\displaystyle \sqrt{8}=2.8282828$ (2) $\displaystyle \sqrt[3]{64}=4$ (3)$\displaystyle \sqrt[3]{-1}=-1$
Originally Posted by mathaddict (1) $\displaystyle \sqrt{8}=2.8282828$ (2) $\displaystyle \sqrt[3]{64}=4$ (3)$\displaystyle \sqrt[3]{-1}=-1$ how do i work it out???
2.8282 * 2.8282 = 7.97.... also equals to 8 4 * 4 * 4 = 64 -1 * -1 * -1 = -1
i understand now thanks alot mate
no problem you just multiply the answer with the itself depending on the root.
Originally Posted by mathaddict (1) $\displaystyle \sqrt{8}=2.8282828$ Not quite. $\displaystyle \sqrt{8} \approx 2.828427125$ or in simplest radical form as $\displaystyle \sqrt{4 \cdot 2}=2\sqrt{2}$
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