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CUET
-- Mathematics - Section A
Linear Programming
$y=x(x-3)^2$ decreases for the value of x given by
$0<x<\frac{3}{2}$
x > 0
1 < x < 3
x < 0
The correct answer is Option (3) - $1 < x < 3$
$y=x(x-3)^2$
$y'=(x-3)^2+2x(x-3)$
$=(x-3)(3x-3)=0$
$x=1,3$
Y is decreasing for $1 < x < 3$