popt9710
28.12.2019 •
Mathematics
The range of the function f(x)=x+5 is {7,9}. what is the functions domain?
is it
{2,4}
{-2,-4}
{12,14}
{-12,14}
{0,5}
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Ответ:
f (x)=-5x^2+7x+6
df(x)/dx=-10x+7
set df(x)/dx=0 to find vertex
10x=7
x=7/10