Substitute the expression for y = (x + 1)(x-5) on the right side of the equation and simplify.
(x-1)(x+5
)
dy
dx
=
(x+1)(x-5)
(x-1)(x+5)
(x-5)(x+5)+
(x + 1)(x-1)
(x + 1
(x-1)(x-5
X(x+5)
=
=
1)2(x+5)-2(+
(x-1)
(x-1)
1)(x+5)
(x-1)(x+5)
(x²+5)
x²+40)
+