(x+2)^2< 25

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Solving an inequality is not different than solving an equality. You need only be careful when you multiply by a negative number, then you must change "direction" of the inequality sign, it makes sense if you think about it (division is simply multiplication of the inverse). Keep also in mind that if for a given variable x it is usually not known whether it's positive or negative we can't simply multiply both sides with that variable but must study the inequalities for positive and negative x. (x+2)^2< 25 <=> (x+2) < 5 <=> x+2 < 5 <=> x < 3