exam Maths Puzzle Numerical Ability

could you please show me how to solve this problem:
(x^2-6x+8)/(x-4)
Thanks for your help in advance.

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exam Other Question

i am unsure on how to work out this problem can you help please?

solve for x
2/3 e^4x=3 3/5

thank you! Peanuts are selling for $2 per pound, and cashews are selling
for $5 per pound. How much of each type of nut would be needed to create
20 lb of a mixture that would sell for $2.75 per pound?