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 wit
h 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!
2 answers:
Answer:
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

Answer:
x=9 is the answer
Step-by-step explanation:
you do 2^2 then 2-2 you add those two answer together than subtract from 15
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