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PLEASE HELP
Your friend, Patricia, is having a hard time understanding the concept behind the domain and range of a parabola. Using complete sentences, explain the meaning of the domain and range of the graph of
y = −x2 + 4x − 21 and how to find both. Keep in mind, your goal is to help Patricia understand the "concepts", not just how to use the steps.
 one year ago
 one year ago
PLEASE HELP Your friend, Patricia, is having a hard time understanding the concept behind the domain and range of a parabola. Using complete sentences, explain the meaning of the domain and range of the graph of y = −x2 + 4x − 21 and how to find both. Keep in mind, your goal is to help Patricia understand the "concepts", not just how to use the steps.
 one year ago
 one year ago

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mark_o.Best ResponseYou've already chosen the best response.1
@ Solmyr do you know if the parabola is opening upward or downward?
 one year ago

mark_o.Best ResponseYou've already chosen the best response.1
if y =  x2 then its downward if y= + x2... then its upward note theres also parabola that opens sideways on the left or at the right
 one year ago

mark_o.Best ResponseYou've already chosen the best response.1
therefore this type of parabola y = −x2 + 4x − 21 is opens upward or downward ?
 one year ago

mark_o.Best ResponseYou've already chosen the best response.1
it is essential to know if the parabola is opening upward or downward or sideways.. :D
 one year ago

mark_o.Best ResponseYou've already chosen the best response.1
Assuming your parabola is y = ax^2 + bx + c: The domain is always all real numbers... To find range, find the vertex. If it opens upward, the range will be [ycoord. of vertex, infinity) Positive 'a' opens up If it opens downward, the range will be (infinity, ycoord. of vertex] Negative 'a' opens downward
 one year ago
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