x=y4 /2
y6 x y2 y4 x y4 y2 x y2 x y4 y2 x y2 x y2 x y2
(x + y)2 = x2 + 2xy + y2 So x2 + y2 = (x + y)2 - 2xy = a2 - 2b Then (x2 + y2)2 = x4 + 2x2y2 + y4 So x4 + y4 = (x2 + y2)2 - 2x2y2 = (a2 - 2b)2 - 2b2 = a4 - 4a2b + 4b2 - 2b2 = a4 - 4a2b + 2b2
y4
True
x=y4 /2
(x2 + y2)(x + y)(x - y) = x4 - y4.
y6 x y2 y4 x y4 y2 x y2 x y4 y2 x y2 x y2 x y2
(x + y)2 = x2 + 2xy + y2 So x2 + y2 = (x + y)2 - 2xy = a2 - 2b Then (x2 + y2)2 = x4 + 2x2y2 + y4 So x4 + y4 = (x2 + y2)2 - 2x2y2 = (a2 - 2b)2 - 2b2 = a4 - 4a2b + 4b2 - 2b2 = a4 - 4a2b + 2b2
-2
exactly...
7
y4
x-7*y*4 >> solve it * is multiply-
It is 1.2164
y = x This is a line and a function. Function values are y values.
X+2 Y=19 X-Y=4