B) x2 - 18x += ( ) ( ) = ( )2
c) x2 + 2 3x += ( ) ( ) = ( )2

step-by-step explanation:

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δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

c) yes, because of asa or aas