Question

a Find dy for the tellows
torowing x² + y2 = 25
6 Given x² + y 2 - 2x - by rs zo find
dy and dry where
.
x=3, y=2
dx
dx2
if x² + 2xy + 3y2 - 4
4
find
dy
dz​

Answer 1

x²-y² . x²-2xy+y²

(x+y)     x-y

(x+y)(x-y) . (x -y)(x - y)

 (x+y)            (x -y)

 (x+y) (x -y)

  x²  - 2xy  + y²

 ==> (1,25)²  - 2( 1,25)(-0,75 + (-0,75)²

==> 1,5625 +  1,875 + 0,5625

==> 4