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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I have a problem with this problem, 16-x squared/ x cubed-2x squared-8x can you help me solve this problem?

rh^2-ph+q=0 solve for h
this is what i have so far

rh^2-ph=-q
h(hr-p)=-q
?