Bonjour,
1) Périmètre = 2(3x-2+(10-2x))
= 2(3x-2x-2+10)
= 2(x+8)
= 2x+16
2) aire = (3x-2)(10-2x)
= 30x-6x²-20+4x
= -6x²+34x-20
