Today in math I learned new concepts. However, I am unsure if these three questions are correct. This is what I did:

Solve by considering all cases. Show each solution on a number line.

Steps I did:

Therefore: -3<x<5 is a solution.

Therefore: x<-2 or 1<x<3 is a solution.

Solve using intervals.

Used quadratic equation to find the roots of

Therefore: x≤-1 or 0.4 ≤ x ≤ 3 is a solution.

Am I correct with the findings? Is what I did to solve for all cases correct?