solve the inequality or compound inequality (in comments, the equation keeps disappearing in the question thing)

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Pls never taught i’m really confused and i rlly need

Oliver had $50 on the day before his birthday. after he recived some money for his birthday , he had $75. write and solve eqaution to find how much money oliver received for his birthday. x+50=75