exam Maths Puzzle Numerical Ability

please help me solve this problem x2-3x+2=0 thank you

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exam Other Question

Please help me, I am having trouble finding the domain of these two equations

f(x)= x+5/x+3

and f(x)=x^2-4/x^2-9
Plot the graphs of the following functions.

f(x)= log2x