book Maths Puzzle Numerical Ability

everyone alwasy shows the main steps in quadratic equations.. but what do you do when it comes to reducing?? here is one of my questions..x2(x squared)-8x-3=0

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book Other Question

find three consecutive odd integers whose sum is 105 Hi there,

I don't get this problem with extraneous solutions at all! Could someone please help me work out this problem before class?
1+3y / y-2 = 6 / y-2

Thank you
AC