Explanation:

(i) ??^2 + 12?? + 35 = 0
??^2 + 7?? + 5?? + 35 = 0
??(?? + 7) + 5(?? + 7) = 0
(?? + 7)(?? + 5) = 0
?? = −7 , −5
(ii) 5?? 2 + 33y + 40 = 0
5?? 2 + 25?? + 8?? + 40 = 0
5??(?? + 5) + 8(?? + 5) = 0
(?? + 5)(5?? + 8) = 0
?? = − 8/5 , −5
?? ≥ x