Question

obtain all the zeros of x³+3x²-5x-15​

Answer 1

Step-by-step explanation:

x³+3x²-5x-15

= x2 ( x+3) -5 ( x + 3 )

= (x2-5) ( x+3)

there fore,

x2-5 = 0. or. x+3=0

=> x2 = 5. =>x= -3

=> x=√5

the zeros are √5 and -3