Question

Jen

想請問這題🙏

15. 設 a、b 皆為實數,若︱ax+1|≤b之解為-1≤x≤4,則數對(a,b) = _
(123

Answer 1

Ian

-1≤x≤4
-1-3/2≤x-3/2≤4-3/2
丨x-3/2丨≤ 5/2
丨-2/3x+1丨≤ 5/3
(a,b)=(-2/3,5/3)