which of the following has the three geometric means of 45, -135, 405?
Answer:
B. -15 and -1,215
Step-by-step explanation:
an=a1(r)^n-1
-1215= -15(r)^5-1
-1215= -15(r)⁴
-15 -15
⁴√81= ⁴√r⁴
-3= r
an=a1(r)^n-1
a2= -15(-3)^2-1
a2= -15(-3)
a2= 45
an=a1(r)^n-1
a3= -15(-3)^3-1
a3= -15(-3)²
a3= -15(9)
a3= -135
an=a1(r)^n-1
a4= -15(-3)^4-1
a4= -15(-3)³
a4= -15(-27)
a4= 405
an=a1(r)^n-1
a5= -15(-3)^5-1
a5= -15(-3)⁴
a5= -15(81)
a5= -1215
I HOPE IT'S HELP
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