book Maths Puzzle Numerical Ability

express in terms i and simplify: sqrt -45

show work please

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book Other Question

In which of the following is y a function of x

a. 3y+2x-9=0
b. x+y^2=5
c. x^2+y^2=25
d. noone of these find domain and range of the function:f(x)=6x^2+4