Answer:
.
Step-by-step explanation:
So that equation was definitely correct...
When you expand the equation in the bracket you'll find out that you'll get a^6 + 4a^4 + !6a^2 - 4a^4 - 16a^2 -64. then your final result will be a^6 - 64
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Pythagoras
28^2-19^2= 423
Square root of 423 = 20.5669638
Answer = 20.5669638
The answer should be c hope this helps
