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Help with QUESTION 9 AND 11:

Help with QUESTION 9 AND 11:-example-1

1 Answer

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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)

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