A) (2x+1)(2x-1)=(2x)²-1²=4x²-1
b) (3x+2)(3x-2)=(3x)²-2²=9x²-4
c) (√ 3+√2)(√ 3- √ 2)=(√3)²-(√2)²=3-2=1
d) (2 √3+3 √ 2)(2 √ 3-3 √ 2)=(2√3)²-(3√2)²=12-18=-6
e) √2x+√3y)(√ 2x- √3y)=(√2x)²-(√3y)²=2x-3y
(a+b)(a-b)=a²-b² aceasta este formula de aplicare la exercitiul dmv.