N=(4x-5)(x-3)-(3x+1)(4x-5) Calculer l'expression N pour x=-1 Merci

bonjour

(4x-5)(x-3)-(3x+1)(4x-5)

(4*-1 -5) (-1-3) -(3*-1 +1)(4*-1 -5)
(-4-5)(-4) -(-3+1)(-4-5)
(-9)(-4) -(-2)(-9)
+36 -(+18)
36-18
18

N=(4x-5)(x-3)-(3x+1)(4x-5)

x = -1

N=(4*-1 -5) (-1-3) -(3*-1 +1)(4*-1 -5)
N=(-4-5)(-4) -(-3+1)(-4-5)
N=(-9)(-4) -(-2)(-9)
N=+36 -(+18)
N=36-18
N=18