Express the area of a rectangle with length 7ab and width 2a as a monomial area =

The area is the product of the length and width.

... Area = (7ab)×(2a) = (7×2)×(a×a)×(b)

... Area = 14a²b

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)

the first one is x^2+2x+2

the second one is x^2+4

the last one is x^2-4x+8