42 : 2 = 21
21 : 3 = 7
7 : 7 = 1
42 = 2 · 3 · 7
15 : 3 = 5
5 : 5 = 1
15 = 3 · 5
GCF(42, 15) = 3
Answer:
the answer is A.
Step-by-step explanation:
169
if S(n)=n^2
so,S(13)=13^2
n=13
n^2=13^2
=169
x = 0
→ Expand out the brackets
6 - 18x + 4x - 6 = 0
→ Collect all the like terms
-12x = 0
→ Now solve
