exam Maths Puzzle Numerical Ability

what is the domain and range for the equation: y=-4

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exam Other Question

Algebraically determine the zero(s) of the functions:
a) f(x)=(sqrt2(5)^-(x+1))-(sqrt50)
b) f(x)=sqrt3(2)(^2(x-3))-sqrt48
how to find the "y"..??

x=-6

y=-2/3x+1