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alyssa5485
12.05.2020 •
Mathematics
Complete the square to rewrite y= x2 - 8x+ 15 in vertex form. Then state
whether the vertex is a maximum or a minimum and give its coordinates.
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Ответ:
there's a minimum at (4, -1)
Step-by-step explanation:
Please use " ^ " to denote exponentiation: y= x^2 - 8x+ 15.
To "complete the square," take half of the coefficient of x (which is -8). Square this result, obtaining 16.
In y= x^2 - 8x+ 15, add 16, and then subtract 16, between -8x and +15:
y = x^2 - 8x + 16 - 16 + 15
This becomes:
y = (x - 4)^2 -1
Reading off the coordinates of the vertex, we get (4, -1). Because the coefficient of the (x - 4)^2 term is positive, we know .there's a minimum at (4, -1)
Ответ:
70kg = x-bar
Step-by-step explanation:
μ(mean of pop.) = x-bar(mean of sample)
70 = x-bar