Question

I need help with circle intersects >.<
please help. i'll post the picture in a bit

Answer 1

You know how to get centre and raddius of circle from it's basic equation ?

Answer 2

yes,, but i need help identifying if they intercept. >.<

Answer 3

so tell me centres and radii of the circles given in first part of (a) in ur book

Answer 4

c:(3,-1) r=1
c:(2,2) r=5

Answer 5

now calculate the distance between the centres :D

Answer 6

by using the distance of two points?

Answer 7

yeah yeah

Answer 8

ohh!! and how about part b :O

Answer 9

Got the part A ?
Now,
1) If sum of the radii is more than the distance between the centres, then they intersect and two distinct points.
2) If sum of the radii is equal to the distance between the centres, then they touch each other at exactly one point.
3) If sum of the radii is less than the distance between the centres, then they DO NOT intersect at any point !

Cheers ! :D

Answer 10

i get it now !!!! thank you!!! \(^-^)
just to be correct the distance formula is square root of (x2-x2)^2-(y2-y1)^2

Answer 11

yeah yeah :D
Enjoy !

Answer 12

thanks so much !!!

Answer 13

howabout a)ii) ??

Answer 14

You have to follow the same method.
Calculate distance between centre and compare it with sum of their radii

Answer 15

so for the center it would be (1,2) r=2

???

the x^2 confuses me

Answer 16

No.. Centre would be (0,2)

x^2 = (x-0)^2 .. right ? so x-coordinate should be zero

Answer 17

ohh i see!!

Answer 18

problem 23 and 25?

Answer 19

Sorry, but I don't understand the question. If you can, please explain :)

Answer 20

i dont get problem 23 and 25

Answer 21

That's what I am saying, what we have to do in 23 and 25 ?? and what are the coordinates given after each question ?

Answer 22

@hartnn have a look please.

Answer 23

yes and i'm not sure

Answer 24

sorry cant help :P

Answer 25

can youelp with this? and it's fine

Answer 26

you help *

Answer 27

Check the points on graph where it intersects x-axis. Those values of x would be the solution of equation y=0

Answer 28

so i write the equation on the calc. and look for the intersections of the x-axis?

Answer 29

The graph is already given ! look at it

Answer 30

i am

Answer 31

answers are right there in the graph
part 1:
the points along the x-axis where curve crosses are the zeros

part 2:
the intervals where curve goes below x-axis is where y<0

Answer 32

okay

Answer 33

nvbjkb