Question

factorise xcube-3xsqure-9x-5​

Answer 1

Answer:

we are putting x=1

sol. = 1-3-9-5 = -16 is not eql to 0.

x= -1

-1 -3 +9 -5 = 0 

hence x= -1 is one sol. of our cubic eqn.

now divide  by x + 1

divident = 

sol. of eqn. x-5 nd x+1

hence all three sol. of eqn are:- x=-1 , x = 5 , x = -1