Please answer this question.
Hello,
Thanks for A2A
This is quite simple:
Let
ax+by+c=0 ?..(1)
bx+cy+a=0 ?..(2)
cx+ay+b=0 ?..(3)
Now add all three equation
ax+by+c+bx+cy+a+cx+ay+b=0
ax+ay+a+bx+by+b+cx+cy+c=0
a(x+y+1)+b(x+y+1)+c(x+y+1)=0
Now put common term outside
(x+y+1)[a+b+c]=0
We that rule if?A*B=0?then either A=0 or B=0 so if
=> a+b+c=0
=> a+b= -c ??(4)
Now calculate cube both side
=> ( a+b)?=(-c)?
=> a?+b?+3ab(a+b)= -c?
Now from equation (4) a+b=-c
=> a?+b?-3abc= -c?
=> a?+b?+c? = 3abc (prove)
Thanks!
Thanks for A2A
This is quite simple:
Let
ax+by+c=0 ?..(1)
bx+cy+a=0 ?..(2)
cx+ay+b=0 ?..(3)
Now add all three equation
ax+by+c+bx+cy+a+cx+ay+b=0
ax+ay+a+bx+by+b+cx+cy+c=0
a(x+y+1)+b(x+y+1)+c(x+y+1)=0
Now put common term outside
(x+y+1)[a+b+c]=0
We that rule if?A*B=0?then either A=0 or B=0 so if
=> a+b+c=0
=> a+b= -c ??(4)
Now calculate cube both side
=> ( a+b)?=(-c)?
=> a?+b?+3ab(a+b)= -c?
Now from equation (4) a+b=-c
=> a?+b?-3abc= -c?
=> a?+b?+c? = 3abc (prove)
Thanks!