Answer:
Third option, 
Step-by-step explanation:
By observation, we can infer that
.
Subtract 8 from both sides:


Subtract 4x from both sides:


Divide both sides by -1:


30^2=a^2+2(a)^2
900=a^2+4a^2
900=5a^2
180=A^2
6√5=a
a=13.4164cm
The answer would be A. Make sure you also use BEDMAAS, and take care of the brackets first
Answer:
all work is shown and set