A circle is centered at the point (-3, 2) and passes through the point (1, 5). The radius of the circle is how many units. The p
oint (-7,? ) lies on this circle.
2 answers:
We know that
the equation of a circle is
(x-h)²+(y-k)²=r²
(h,k) is the center----------> (-3,2)
the radius is the distance point (-3,2) and point <span>(1, 5)
d=</span>√(5-2)²+(1+3)²-------> d=√9+16----------> d=5
radius=5 units
equation is
(x+3)²+(y-2)²=25
for x=-7
(-7+3)²+(y-2)²=25-------> 16+y²-4y+4=25
y²-4y-5=0
using a graph tool -------> to resolve the second order equation
see the attached figure
the solution is
y1=-1
y2=5
the point will be
(-7,-1)
(-7,5)
the equation of a circle is
(x-h)²+(y-k)²=r²
(h,k) is the center----------> (-3,2)
the radius is the distance point (-3,2) and point <span>(1, 5)
d=</span>√(5-2)²+(1+3)²-------> d=√9+16----------> d=5
radius=5 units
equation is
(x+3)²+(y-2)²=25
for x=-7
(-7+3)²+(y-2)²=25-------> 16+y²-4y+4=25
y²-4y-5=0
using a graph tool -------> to resolve the second order equation
see the attached figure
the solution is
y1=-1
y2=5
the point will be
(-7,-1)
(-7,5)
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I think this the correct solution. but please correct me if I'm wrong
Answer:
x = ±
Step-by-step explanation:
Given
x² = 20 ( take the square root of both sides )
x = ±
which can be simplified to
x = ± 2
[ ± means plus or minus ]