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

4372 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

Differentiate y = 2e^(2x+1)


Find the x and y coordinates of the turning points of the curve 'y = x^3 - 3x^2 +4'. Identify each turning point as either a maximum or a minimum.


Find the equation of the tangent line to the graph of y=2x^4-7x^3+x^2+3x when x=5


Integrate 1/((1-x^2)^(1/2)) by substitution


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