Question

Tentukan HP ....
1.{x|x2 – x – 1 } ∪ { x | x2 – x – 1 < 1 }

Answer 1

Misal:
A = { x | x² - x -1, x ∈ R }
B = { x | x² - x - 1 < 1 }

Karena, B ∈ A
maka, ...
A U B = B = { x | x² - x - 1. x ∈ R }