Answer:
6.7
Step-by-step explanation:
Let x = the geometric mean
Then, 3/x = x/ 15
= 45
x = = 6.7
Since only the first term has ax for coefficients the GCF cant be -3ax^5.
The GCF would be -3a
Factor -3a out of all the terms:
-3a(2x^7)-3a(-4a^5)-3a(a^4)
Now factor -3a out of the equation for the final answer:
-3a(2x^7-4a^5+a^4)
-> 3rd answer is correct
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