exam Maths Puzzle Numerical Ability

v(v^2-1)+12w^2-(3v+w)(4w-v)

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exam Other Question

find (a)f o g (b)g o f .find the domain of each function and each composite funcition.

Given: f(x)= x^2 +1 g(x)=square root of x

i can find f(g) and g(f) but i cant find the domains I am challenging a question and need your help. Can you tell me what the distance between (5,1) and (3,8) is. Thank you so much!