Question

|a-9|<4

Answer 1

wrong section bud

Answer 2

Hello, you want to post this in the math section. You have |a - 9| < 4, meaning, negative or positive will be less-than four.

Subtract a.
-9 < 4 - a

Now, we do the reverse, add A, and have a positive nine (because its absolute value)

9 < 4 + a

Therefore, your solutions are -9 < 4 - a and 9 < 4 + a