A circle with equation x^2+y^2-2x+8y-40=0. Find the circle centre and the radius

2g=-2, -g=1. 2f=-8, -f=4. cc(-2,4). r=√(g^2+f^2-c)=√(4+16+40)=√80=4√5

LM
Answered by Liam M. Maths tutor

4264 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

What is a good method to go about sketching a polynomial?


Find the cross product of vectors a and b ( a x b ) where a = 3i + 6j + 4k and b = 6i - 2j + 0k.


Integrate (1 - x^2)^(-0.5)dx within the limits 0 and 1


Find the equation of the line perpendicular to the line y= 3x + 5 that passes through the point (-1,4)


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning