The equation of a circle is given by 2x^2+2y^2-8x+5y-10=0 find the coordinates of P and Q if the circle cuts the x-axis as at the points P and Q
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Expert's answer
2022-02-04T05:28:20-0500
Equation of the circle is, 2x2+2y2−8x+5y−10=0. We first write this equation in the form, (x−h)2+(y−k)2=r2 where (h,k) and r are the center and radius of the circle.
So,
2x2+2y2−8x+5y−10=0⟹2x2+2y2−8x+5y=10. Putting the x terms and y terms together,
2x2−8x+2y2+5y=10
Dividing through by 2,
x2−4x+y2+25y=5
Completing the squares,
(x2−4x+4)+(y2+25y+1625)=5+4+1625=16169
We can rewrite this equation as,
(x−2)2+(y+45)2=16169...........(1).This is the equation of the circle.
The center of this circle has coordinates (2,−45) and radius r=413
To find the x intercept, we set y=0 in equation 1.
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