The angle at vertex D is acute.
Triangle DEF is a right traingle.
Answer: B
Step-by-step explanation:
We can rearrange the equation to get
, which clearly has complex roots.
Answer:
<u>Answer</u><u>:</u><u> </u><u>2</u>
Step-by-step explanation:

express the mixed fraction into proper fraction:

then solve simplify:

solve the bracket:

then simplify:
