Question 1 :
V48 = V(16*3)
V48 = 4V3
Question 2 :
(10-4)(10+4) = 6 * 14 = 84
Question 3 :
(-7x+8)^2
49x^2 - 112x + 64
Avec x^2 : x au carré
Question 4 :
V125 = V(25*5)
V125 = 5V5
Question 5 :
V162 = V(81*2)
V162 = 9V2
Question 6 :
(40-1)(40+1)= (40)^2 - 1
= 1600 - 1
= 1599
Question 7 :
(-6x-2)(-6x+2)
= (-6x)^2 - (2)^2
= 36x^2 - 4
= 4 (9x^2 - 1)
Avec x^2 : x au carré
Question 8 :
16 - x^2
= (4 - x)(4 + x)
Question 9 :
25 - 9x^2
= (5 - 3x)(5 + 3x)
Question 10 :
(2x + 5)(2x - 5)
(2x)^2 - (5)^2
4x^2 - 25