Mathematics
12 Online
Nicole:
Check please?
http://prntscr.com/nu3o71
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Nicole:
@Vocaloid
Vocaloid:
not quite, remember that the x-coordinate of the vertex is -b/2a
you probably missed a sign somewhere
Nicole:
so C?
Nicole:
or B
Vocaloid:
you also have to make sure the zeroes are 10 and 14
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Nicole:
then B
Vocaloid:
it can't be B
remember, the x-coordinate has to be -b/2a = 12
Vocaloid:
slow down, figure out which ones have the right x-coordinate, then factor those possibilities and see which ones give you zeroes of 10 and 14
Nicole:
so its D
Vocaloid:
yes
2x^2 - 48x + 280 ---> gives you -b/2a = -(-48)/2(2) = 12 as the x-coordinate, and (x-10)(x-14) when factored
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Vocaloid:
good
Vocaloid:
good
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Vocaloid:
good
Vocaloid:
good
Vocaloid:
good
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Vocaloid:
good
Vocaloid:
good
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Vocaloid:
that's really close but (x-1) moves the function 1 unit to the right (positive value of h)
Nicole:
C*
Vocaloid:
yes
Vocaloid:
yes good
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Vocaloid:
good
Vocaloid:
for the first one h *does* move the graph left or right (a.k.a horizontally)
second question is good
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Vocaloid:
good
Vocaloid:
good
Vocaloid:
good
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Vocaloid:
check again
remember cos is adjacent/hypotenuse
Nicole:
A?
Vocaloid:
good
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Vocaloid:
good
Vocaloid:
good
Vocaloid:
good
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Vocaloid:
good
Nicole:
okay thanks for helping