Answer:
the answer is A
Step-by-step explanation:
Could you make the picture clear and back it up a little then i will see it better
Step-by-step explanation:
log <base a> b = x
means
a^x = b
So
3^2 = x^2+7x+21
x^2 + 7x + 21 - 9 = 0
x^2 + 7x + 12 = 0
(x+3)(x+4)
x = -3 or -4
They can help you find a common denominator by the bottoms of each fraction if the top ones don't have the same denominator.
Parallel bc the slopes the same!