Question

va rog urgentttttttttttttttt dau coroana​

Answer 1

1. x²-2x-3 >/ 0

delta = b² - 4ac = 4 +12 = 16

x1 = (-b + Vdelta)/2a = (2+4)/2 = 6/2 = 3

x2 = (2-4)/2 = -2/2 = -1

A= [-1, 3] = {-1, 0, 1,2,3}

x²-36 < 0

x² < 36

x < V36

x < 6

B = (-infinit, 6) = {.....1,2,3,4,5}

a) AUB = {-infinit....5}

b) A∩B = {-1, 0,1,2,3}

2. multimea A are sigur doar 3 elemente

Din A ∩{a,b} = {a} Ambele multimi au in comun a

Fata de {b,c} A mai avea elementul a si d

Deci A= {a,d,c}

3. x²+2x-3 >/ 0

delta = 4+12 = 16

x1 = (-2+4)/2 = 2/2 = 1

x2 = (-2-4)/2 = -6/3 = -2

A = [-2,1] = {-2,-1, 0, 1}

x < 1 = > B = (-infinit, 1) = {.... -2, -1, 0}

a) AUB = (-infinit, 1]

b) A∩ B = {-2,-1, 0}

4 nu stiu