book Maths Puzzle Numerical Ability

Could someone help me please with this problem?
I am having a meltdown with polynomials, LCDs and division.
I am supposed to find the LCD, convert into an equivalent rational exp

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book Other Question
I know this is the answer for 2X^2-3X+1=0. But if it were to be left irrational root in simplest form would this be it?

3(+-)Sqrt 1 / 4 which of the following is one of the two binomial factors of 6s2+40s-64