Comment développer 2(4x+8) (x+2)?

2(4x+8) (x+2)= 2 ( 4x2 +8x + 8x + 16)
= 2x2 + 4x + 4x + 8
= 2x2 + 8x + 8

2 (4x+8)(x+2) = (2×4x )+(2×8) (x+2) =(8x +16 ) (x+2) =((8x × x ))+(8x × 2 )) + ((16× x ) + ( 16 × 2 )) =(8x + 16 x ) + ( 16x + 16 ) =24x + 16x + 16 =40 x + 16