Recent content by Nikolas7

Please, help with system of equations: f(x,y)=(5,-2)t+(1,1) g(x,y)=(-15,6)t+(-2,2)

Yes, I figured out, thanks

Please, show details how you got (x−5)log4=(2x−1)log7

Help me with the following equation: ${4}^{x-5}$=${7}^{2x-1}$

Thanks

Thanks, I did too and got points: max (-1.08,8.08), min (0.41,-1.86).

at smaller root we have local maximum and at bigger root we have local minimum. Is it right?

18${x}^{2}$+12x-8=0 It's quadratic equation. Solve, I got x1=0.41 x2=-1.08. Then I found max and min 8.08 and -1.86. Thank you.

Find local maxima and minima for 6${x}^{3}$+6${x}^{2}$-8x. I found that (-1.08,8.08) is max, (0.41,-1.86) is min. Where i was wrong?

Can you advice the changes in this diff equation: $\d{y}{x}=\dfrac{y}{x^2+y^2}$

Sorry, you are right: s"=2r(s')^2 because y'=exp(s)s' and y"=exp(s)((s')^2+s") Many thanks.

Thanks, but I got s"=2r. will try to resolve again.

Yes, it is true. What is solution this?

Thanks for your reply. 1. What is function for compare? I don't know yet. I confused by the square of ln. 2. I try to change arrcos on arcsin. Can i use arcsinx=pi/2-arccosx?

help to solve the differential equation у*у$^{\prime\prime}$=2х*((у$^{\prime})$^2)