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you need to be in a advanced maths class as you need to learn as mu8ch maths as you need to.
You study, understand and practice - as with any other subject.
Maths day is celebrated due to it being made by important people like this Greek mathematican called Pythagoras of Samos. He invented The maths 'Pythagoras Theroem'. We celebrate it to remember who made maths a important subject.
Advanced maths like calculus, trigonometry etc can be used to find areas of irregular objects. Simple math is use extensively in daily life like statistics.
Look in an advanced maths book.Improved answer:-If the discriminant of the quadratic expression is less than zero then it's not possible to factor it.