- Show me how i can get parametric equation for (y-1)^2=16 (x-2) Show the step in precise, thanks .?

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If the set of real roots of the function f(x) is {-7,-5,1}, find the set of real roots of: f(−4x)
f(x2)
f(x3+1)? What does the symbol that looks like a < turned clockwise 90 degrees represent? What does the number on vertical distance? How can I calculate the final velocity when the the initial velocity is unknown and all I have is the mass, acceleration, and speed? Doesn't the increase of mass slow down a galaxy causing its radius vector to expand ,and the opposite if it lose mass?