Answer:

Step-by-step explanation:
x² + 6x + 9 = 12 → x² + 6x - 3
Since this Quadratic Expression is unfactorable, apply the <em>Quadratic</em><em> </em><em>Formula</em>:


√48 = √[3 × 16] = 4√3
½[4√3] = 2√3
Then attach half of -6 to it as well [-3]:
-3 ± 2√3
I am joyous to assist you anytime.
It's impossible for 2 factors of 12 to add up to 16. So there would be no answer to that.
7 and 21 I believe, hope you get it right
Answer:
Distance between nina's house to her friend's home = AC = 5 miles
Step-by-step explanation:
Distance between nina's house to her school = BC = 4 miles
Distance between nina's school to her friend's home = BA = 3 miles
Distance between nina's house to her friend's home = AC = ??
From the ΔABC



AC = 5 miles
Therefore Distance between nina's house to her friend's home = AC = 5 miles