Solving a cubic system of equation

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So today we have cubic equation that is very quick and easy to solve the but the main motive is teach you how can we use a kind of proper substitution to solve a pair of equation without any ridiculous calculation .

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Thanks to Christian Castillo from PERU for suggesting this problem

#algebra #maths #mathematics
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I solved it without substitution.But it takes a little bit lengthy!

supramitra
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Fun fact: If the discriminant of a cubic is negative then all the roots will be real.(Provided that there are no imaginary inputs)

aahaanchawla
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Noice! What is the story with the pig? Is it your favorite animal?

yoav