Aduceti la forma cea mai simpla expresia, dau coroana
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Răspuns:
-rad2 • rad8 = -rad16 = -4
-rad2 • rad2 = -rad4 = -2
-4x - 2 + x^2 + 4x + 4 + x^2 - 4 =
2x^2 - 2 =
2(x^2 - 1) =
2(x-1)(x+1)
Dacă x = -rad3 :
2(-rad3 - 1)(-rad3 + 1) =
2(-3-1) =
2•(-4) =
-8