a²b²x²+b²x-a²x-1=0 factorise the quadratic polynomial
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a²b²x²+b²x-a²x-1
=b²x(a²x+1)-1(a²x+1)
=(a²x+1)(b²x-1)
=b²x(a²x+1)-1(a²x+1)
=(a²x+1)(b²x-1)
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