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anonymous
 one year ago
10. Find the set values of k for which the line y=kx4 intersects the curve y=x^22x at two distinct points.
Pleas help, I don't know what do do with this question. I tried solving it simultaneously and the using b^24ac but that didn't get me anywhere.
anonymous
 one year ago
10. Find the set values of k for which the line y=kx4 intersects the curve y=x^22x at two distinct points. Pleas help, I don't know what do do with this question. I tried solving it simultaneously and the using b^24ac but that didn't get me anywhere.

This Question is Closed

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1you tried? let me try the same thing, kx 4 = x^2 2x x^2  (k+2)x + 4 = 0 A = 1, B = (k+2) , C = 4 you got same values?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Oh, no not at all. I didn't even end up getting any values.

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1i though you said you used b^2 4ac what values of a,b,c did u get?

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1for 2 distinct points b^2 4ac must be > 0

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0I will send a picture of my working out.

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0sorry [{(k+2)}^24*1*4]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So after k^2>4k12 I didn't know what to do

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1oh yeah, \((k+2)^2 16 > 0 \\ (k+2)^2 >16\) keep this as is and take square root on both sides...

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\left( k+2 \right)^2>4^2,\left k+2 \right>4,k+2<4,k<6~or~k+2>4,k>2\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok I am getting the right numbers now (2 and 6) but the symbols are wrong. I got k>2 and k>6 but it actually k>2 and k<6

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1k+2 > 4 k+2 > 4 or k+2 < 4

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1it like if a >b then a >b or a < b

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0So the symbols switch when you take the square root of everything? Depending on if you are working with the positive or negative?

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1symbols switch when you multiply a negative on both sides

hartnn
 one year ago
Best ResponseYou've already chosen the best response.1in case of a > b dw:1442155794098:dw

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Ok, I think I understand now. Thank you very much! Your explanations really helped me!
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