x 0 1 2 3 4 5 6 7 8 9
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f(x) = √x 0 1 1,41 1,73 2 2,23 2,44 2,64 2√2 3
x 4 9 16
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f(x) =√x 2 3 4
f(49) = √49 =7 punctul pe grafic A ( 49 , 7)
f(0,04) = √0,04 = 0,2 B ( 0,04 ; 0,2)
f(121 ) = √121 = 11 C ( 121 , 11)
f(625) = √ 625 =25 D ( 625 , 25)