How do I solve the polynomial inequality #-12<-2(x+1)<=18#?
Step 1: Divide all three "parts" by -2 and switch the direction of the inequality symbols.
Step 2: subtract 1 from all three "parts".
For your solution, you may need to draw a number line. Be sure to use an open circle at 5 and a closed circle at -10.
My students are also required to use interval notation: