Question

$\sqrt{ \times - 1} = \times - 3 \: \: \: \: \: \: \: \:$
mulțimea nr reale
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Answer 1

Răspuns:

x-1=(x-3)^2

x-1=x^2 - 6x + 9

x^2 - 7x + 10 = 0

delta = 49-40 = 9 =>rad.delta = 3

x1=(7-3)/2=2

x2=(7+3)/2=5