exam Maths Puzzle Numerical Ability

hello, please can you help me solve this. √2x+1=3 I got confused,

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exam Other Question

find the slope of the line that passes through the given points

(3,f(3)) and (3+h,f(3+h))
solve the equation:
[2x-[3x=1]]=1

*brackets meaning absolute value*
Thank you!