Question

11 va rog!!!! Dau orice!

Answer 1

Pt A 2x+1 apartine D15

D15 ={-15,-5,-3,-1,1,3,5,15}

2x+1 = -15 => 2x = -16 => x = -8

2x+1 = -5 => 2x = -6 => x= -3

2x+1 = -3=> 2x = -4 =>  x = -2

2x+1= -1 => 2x = -2 => x = -1

2x+1 = 1 => 2x = 0 => x = 0

2x+1 = 3 => 2x = 2 => x = 1

2x+1 = 5 => 2x = 4=> x = 2

2x+1 =15=> 2x=14=> x= 7

Deci A={-8, -3, -2, -1, 0, 1, 2, 7}

Pt B 2x+3 apartine D21

D21 ={-21, -7, -3, -1, 1, 3, 7, 21 }

2x+3 = -21 => 2x = -24=> x = -12

2x+3 = -7=> 2x= -10 => x = - 5

2x+3 = -3=> 2x= -6 => x = -3

2x+3 =-1 => 2x= -4 => x = -2

2x+3 = 1 => 2x = -2 => x = -1

2x+3 = 3=> 2x= 0 => x = 0

2x+3 = 7=> 2x= 4=> x= 2

2x+3 = 21=> 2x= 8 => x =4

B={-12, -5, -3, -2, -1, 0, 2,4}

a) A U B ={ -12, -8, -7, -3, -2, -1, 0, 1,2,3, 4, 7 }

b) A  intersectat B ={ -3, -2, -1, 0, 2}

c) A \ B ={ -8, 1, 7}

d) B \ A ={-12, -5, 4}