Question

D={x:x^2<25,x € N}
F={x:2x+1<8,x€W

Answer 1

Given D = { x : x² < 25, x € N }

Roster Method :

D = { 1,4,9,16 }

and

F = { x : 2x + 1 < 8 , x € W }

Roster Form:

F = { 1,3,5,7 }

Explanation:

i) If x = 0 then 2x + 1 = 2×0+1 = 1

ii) If x = 1 then 2x+1 = 2×1 + 1 = 3

iii) If x = 2 then 2x+1 = 2×2+ 1 = 5

v ) If x = 3 then 2x+1 = 2×3 + 1 = 7

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