Question

Find the value of P so that the polynomial px(x - 3 )+ 9 is equal to zero has two equal root

Answer 1

px²-3px+9,

here
a=p, b=-3p, c=9,

since roots are equal

then

b²=4ac,

(-3p)²=4×p×9,

9p²=4p×9,

p²=4p,

p=4