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anonymous
 4 years ago
these are really hard for me.. Can someone help?
The vertex of y = 9  8x  x2 is (4, 25)
True or False
What is the vertex for the function? y = x2  4x  3
Anwsers:
(1, 2)
(0, 3)
(1, 6)
(2, 7)
anonymous
 4 years ago
these are really hard for me.. Can someone help? The vertex of y = 9  8x  x2 is (4, 25) True or False What is the vertex for the function? y = x2  4x  3 Anwsers: (1, 2) (0, 3) (1, 6) (2, 7)

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anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0I am assuming that when you say x2 you mean \[x^2\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Can you help me with the previous ones i posted?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0To do this, we find the axis of symmetry, which (in standard form of ax^2 + bx + c) is x = b/a which in this case is 8, then we plug that into x to get the yvalue of the vertex, 9, so the vertex is (8, 9)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0can you help me with these two? What are the values of a, b, and c in the function? List them in order with commas, such as 1,2,3. y = 2x2 + 5x  4 What is the vertex for the function? (You will want to find the axis of symmetry first.) Write as an ordered pair, leaving no spaces, such as (1,4). y = 3x2 + 6x

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0look at the standard form i posted above.

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[y = ax^2 + bx + c\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0now you can do the first one, then look how I found the axis of symmetry above, b/a, in this case on the second question 6/3 = 2

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Ok, What about the first one?

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0\[y = ax^2 + bx + c \] this is the standard form of a quadratic equation, quadratic means that the highest exponent is 2 such as \[x^2\]

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0find the coefficients of x^2 and x in their respective places relative to a and b, c is the constant number on the end (4)

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0One more? Thanks so much for your help! Which coefficient in the function tells us that the parabola for the function will point downward? y = 2x2 + 5x  4

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0the direction of the parabola depends on whether the coefficient of the x^2 term is positive or negative. If it is positive such as 5x^2 it will point up, but 3x^2 would point down. In this case 2 is the coefficient which means it points downward

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0HOW DO I FIGURE THIS OUT \[6\sqrt{2}  3\sqrt{2}\]
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