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2014-03-17T12:12:01+01:00
Ex. 2
1) C = 3√20
C = 3 \sqrt{4\times 5} = 3 \times 2 \sqrt{5} = 6 \sqrt{5}
D = 6 \sqrt{500} = 6 \sqrt{5 \times 100} = 6 \times 10  \sqrt{5} = 60 \sqrt{5}
E = -7 \sqrt{75} = -7 \sqrt{3\times25} = -7 \times5 \sqrt{3}= -35 \sqrt{3}

2) T =  \sqrt{14}  \times  \sqrt{28} =  \sqrt{14 \times 28}  = \sqrt{7 \times 2 \times 7 \times 4}
T =  \sqrt{49 \times 4 \times 2} = 7 \times 2  \sqrt{2}  = 14 \sqrt{2}

I =  3\sqrt{200} =  3\sqrt{100 \times 2} = 3 \times 10  \sqrt{2} = 30  \sqrt{2}

N = -2 \sqrt{216} =  -2\sqrt{36 \times 6} = -2\times6  \sqrt{6} = -12 \sqrt{6}