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Is it centre (2,-1) radius root 5?

I can get up to this point. It's just I don' know what to do next.

Thanks, explained perfectly. Can anyone help me with the other 2?

I've nearly finished this exercise, but the final 3 questions I just plain do not get. 12) A point P(x,y) moves so that its distance from (3,4) is proportional to its distance from (-1,2). Find the equation of the locus of P if the origin is a point on the locus. 13) A is a point where...

I'm just wondering what's the best PRELIMINARY chemistry textbook out there. Specifically, I'm looking for one with questions and answers to them, in addition to the text.

Why is it 2 instead of root 2?

Can somebody show me how to do this. We just started locus. A point is root 2 units from the line with equation y=x Why isn't it just y = plus/minus root 2

Thanks mate. I got another one here. For what values of c is the line y=x+c a tangent to the circle x^2 + y^2 = 4? Find the coordinates of the point of contact I have already found that c = plus or minus 2 root 2 But I'm not sure how to find the coordinates.

I need help with this question. For what value of c is the line y=2x+c a tangent to the parabola y=x^2 -x -2

I have a question and I'm not sure how to solve it. Show that the roots of the equation 4(m+1)x^2 -4(m-1)x -3 = 0 (m does not equal -1) are real for all m. P.S. Can you take the discriminate of a discriminate?

If anyone has some notes in the topic of 8.3 Electrical Energy in the Home I only need the first sub-heading which is </O:p <O:p <O:p8.3.1 Society has become increasingly dependent on electricity over the last 200 years If someone has some, I would greatly appreciate it since I'm finding...

Describe molecules as particles which can move independently of each other Can someone give me some pointers as to how to approach that.

omg. You're a genius and I'm a dumbass

I did. It didn't work. All I got was 2l=3k and 4l=3k

Sorry to bther you guys but I wanna get all my homework done. I got a question on division of a line in a given ratio. I know how to get the co-ordinates of a point but I can't get the ratio. Given the poits A(-1,1) B(3,5), C(6,8) lie in one line find in what ratio a) B divides AC b) C...

Oh thanks. Should have seen that myself :( :)

Hi. I'm not sure what the question is trying to say (esp. the tangent part) Lines y=mx+2 and y=5x-9 intersect at an acute angle whose tangent is 2/5. Find the possible values of m. If somene could tell me what the tangent part means, I can do the rest of the question.

Hi. I have copied some notes in class and didn't get to finish them. If you can sort of help me complete the point, it would benefit my studies. Note: 1)If m1m2 = -1, the lines are perpendicular ie theta = 90degrees tan theta is undefined 2)If m1=m2, the lines are parallel ie theta =...

hermand ur a genius Edit. I got another question I'm stuck on. If f(x) = 2x -1, show that f(a^2) = f(-a^2) for all real a.

I seem to have real trouble doing this function notation question: Find the values of b if f(x) = 3x^2 -7x +1 and f(b) = 7 Also, how do you solve limit equations with more than one pronumeral ie. lim as h approaches 0 lim as h approaches 0 lim as x approaches c