Hey guys I really need help. You don't have to give the answer I just really need an explanation as to how to find the roots with work, thank you so much.
Find the roots of f(n)=n^2-2n-15.
Tip: The ^2 means "to the power of" so n^2 is n to the power of 2.
Please help!

Step-by-step explanation:

1. by making factors

consider ax²+bx+c=0

if a×c or ac>0 , then break b=d+e such that de=ac

if ac<0,then write b=d-e (e.g.,5-2=3)

such that de=ac

here n²-2n-15

1×-15=-15

-2=-(5-3)

5×-3=-15

n²-2n-15=n²-(5-3)n-15

=n²-5n+3n-15

=n(n-5)+3(n-5)

=(n-5)(n+3)

roots are n-5=0,n=5 and n+3=0,n=-3

2. by using formula

ax²+bx+c=0

water molecules will move from the side of higher water concentration to the side of lower concentration until both solutions are isotonic. at this point, equilibrium is reached. in an isotonic solution, the flow of water in and out of the cell is happening at the same rate.

hope this < 3

its a, i had the same answer, its from study island right

step-by-step explanation: