Réponse :
salut
Explications étape par étape
A = (5x+2)(3+4x)+(2x+3)(6x+2)
A= 15x+20x² +6+8x+(2x+3)(6x+2)
A= 23x+20x²
+6+(2x+3)(6x+2)
A= 23x+20x² +6+12x² +4x+18x+6
A= 23x+20x² +6+12x² +22x+6
A= 23x+32x² +6+22x+6
A= 45x+32x²
+6+6
A=45x+32x² +12
B=(3z+1)(2z−1)+(7z+2)(3z−4).
B=6z² −3z+2z−1+(7z+2)(3z−4)
B=6z² −z−1+(7z+2)(3z−4)
B=6z² −z−1+21z² −28z+6z−8
B=6z² −z−1+21z² −22z−8
B=27z² −z−1−22z−8
B=27z²
−23z−1−8
B=27z² −23z−9
C=(2n−3)(6n−4)−(3n−2)(5−2n
C=12n² −8n−18n+12−(3n−2)(5−2n)
C=12n² −26n+12−(3n−2)(5−2n)
C=12n² −26n+12−(15n−6n ²−10+4n)
C=12n² −26n+12−(19n−6n² −10)
C=12n² −26n+12−19n+6n² −(−10)
C=12n² −26n+12−19n+6n² +10
C=12n² −45n+12+6n²
+10
C=18n²
−45n+12+10
D=(4−6y)(−3+6y−(6y+3)(−3−8y)
D=(4−6y)(−3+6y−(−18y−48y y ²−9−24y))
D=(4−6y)(−3+6y−(−42y−48y y ² −9))
D=24+192y+192y y² −36y−288y y² −288y y³
D= 24+156y−96y y² −288y y ³
