Expansion Numerically Impractical. Show that the computation of an nth-order determinant by expansion involves n! multiplications, which if a multiplication takes 10-9 sec would take these times:
n 10 15 20 25
time 0.004 22 77 0.5 x109
sec min years years

Step-by-step explanation::

guess at question:

a vertical line intersects the graph of g(x,y) = 0 at two points. what conclusion follows about the function f(x) implicitly defined by g(x,f(x)) = 0?

the domain of f(x) cannot include the x coordinate of any such vertical line.

informally, f(x) is not a function, and

g(x,y)=0 cannot be solved for y uniquely.

the relation r = {(x,y) such that g(x,y) = 0} is a function if

for all (a,b) ∊ r and (c,d) ∊ r, a=c implies b=d.

step-by-step explanation: