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2(8+rad.18) -3 (4+rad.8)

Răspuns :

2(8 + √18) - 3(4 + √8) = 
2(8 + 3√2) - 3(4 + 2√2) = 
16 + 6√2 - 12 - 6√2 = 
4
16 +2[tex] \sqrt{18} [/tex] - 12 - 3[tex] \sqrt{8} [/tex] 
[tex] \sqrt{18} = \sqrt{9*2} = 3 \sqrt{2} [/tex]
[tex] \sqrt{8} = \sqrt{4*2} = 2 \sqrt{2} [/tex]
16+ 6[tex] \sqrt{2} [/tex] -12 -6[tex] \sqrt{2} [/tex] = 16 -12 = 4