Answer:
Explanation:
9.
f(x)=x²-10x+3
=x²-10x+25-25+3
=(x-5)²-22
vertex is (5,-22)
it has horizontal tangent at (5,-22)
or
f(x)=x²-10x+3
f'(x)=2x-10
it has horizontal tangent where 2x-10=0 or x=5
f(5)=5²-10(5)+3
=25-50+3
=-22
it has horizontal tangent at (5,-22)