How do you check your answer or plug it in after solving |2x + 1| = 9 ???

Will give brainliest what is the value of x? enter your answer in the box.

If you answer 2+2 you will get over 80 points

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.