Question

Rezolvati:
a)A={ x (apartine) N | 2x+1=17}
b)B={ x (apartine) N | 3 (la puterea n)=27}
c)C={ x (apartine) N | 0 (mai mic sau egal) x - 4 < 3}

Answer 1

a) 2x=16 => x=8; b) 3 la n=3 la3 => n=3; c) adunam 4=> 4≤x<7 => C={4;5;6}

Answer 2

a)
2x+1=17
2x=17-1
x=16/2
x=8∈N
b) 3ⁿ=27
3ⁿ=3³
n=3∈N
c)0≤ x-4< 3
x-4< 3
x< 3 +4
x< 7
x∈[0;1;2;3;4;5;6]∈ N