Explanation:

(i) 4??^2 + 9?? + 5 = 0
4??^2 + 4?? + 5?? + 5 = 0
4??(?? + 1) + 5(?? + 1) = 0
(4?? + 5)(?? + 1) = 0
?? = −1 , − 5/4
(ii) 3??^2 + 5y + 2 = 0
3??^2 + 3y + 2y + 2 = 0
3??(?? + 1) + 2(?? + 1) = 0
(3?? + 2)(?? + 1) = 0
?? = − 2/3 , −1
?? ≥ x