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Apex Learning - Courses New Tab exlearning.com/public/activity/8004003/assessment mainder o... Downloads Apex Learning - Co... New Tab Question 3 of 10 What is the vertex of the graph of the function below? y = x2 - 10x+ 21 O A. (5,0) C O B. (5,-4) O C. (3,-4) D. (3,0)

Apex Learning Courses New Tab exlearningcompublicactivity8004003assessment mainder o Downloads Apex Learning Co New Tab Question 3 of 10 What is the vertex of t class=

Respuesta :

the given expression is,

[tex]y=x^2-10x+21[/tex]

the standard equation is y = ax^2 + bx +c

it is a quadratic equation, so the x coordinate of the vertex of this equation is,

= -b/2a

so, the x coordinate is,

= -(-10)/2(1)

= 10/2

= 5

put x = 5 in the above equation,

y = 5^2 - 10(5) + 21

y = 25 - 50 + 21

y = 46 - 50

y = -4

so the vertex is (5, -4) that is option B

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