(x+3)⋅(4x+3)=

(x−y)⋅(4x−y) =

(2 + x)(2 − x) =

(2 + k)(1 − m) =

(x − 2)(3x -2) =

(−a + 2c)(4a + c)=

(5x –10):5 =

(4x2 – 8x) : 4 =