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kcameronanderso
28.06.2019 •
Mathematics
Find the x-intercepts of the parabola with
vertex (-3,-14) and y-intercept (0,13).
write your answer in this form: (x1,y1), (x2,42).
if necessary, round to the nearest hundredth.
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Ответ:
Step-by-step explanation:
step 1
Find the equation of the quadratic equation
we know that
The equation of a vertical parabola into vertex form is equal to
where
(h,k) is the vertex
a is a coefficient
we have that
(h,k)=(-3,-14)
substitute
Remember that the y-intercept is the point (0,13)
substitute the value of x and y in the equation and fond the value of a
For x=0, y=13
The equation is
step 2
Find the x-intercepts
The x-intercepts are the values of x when the value of y is equal to zero
so
therefore
the x-intercepts are
or
see the attached figure to better understand the problem
Ответ:
if he walked 4 km in 50 minutes
? km in 1 hour
(1 hour=60 minutes)
?.50=4.60
?=6.4/5
?=4.8