Question

Write the following in roster form

{x ∈ N : 4x + 9 < 52}

Answer 1

4x + 9 < 52

4x + 9 – 9 < 52 – 9

4x < 43

x < `43/4` (i.e.) x < 10.75 4

But x ∈ N

∴ A = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}