aguerobia
28.01.2021 •
Mathematics
The expressions 2(x^2 – 4x– 21) - (x – 7)(x + 77) and ( x– 7)(x + k) are equivalent.
What must be the value of k?
A.-148
B.-71
C.83
D.160
Solved
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Ответ:
we know that
the equation of the circle is of the form
(x-h)^2+(y-k)^2=r^2
where
(h,k) is the center of the circle
r is the radius of the circle
in this problem we have
(x+5)^2+(y-k)^2=r^2
so
the center is the point (-5,3)
the radius is 4 units
therefore
the answer is
The radius of the circle is equal to 4 units