Answer:
a
ethe answer is a becayse if you subtract 12 from 20 you would get 8 and thats answer.th
Step-by-step explanation:

This is the Pythagorean identity, therefore
.
Do you just need to simplify?
With a=5, b= -4 and c=3, the discriminant is
16-4(5)(3) = 16-60, a negative number. Thus, the roots are non-real (complex).
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