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2.Efectuati , utilizând formula ( a+b)(a-b)=a la 2-b la 2:
a)(x+2)(x-2)=
b)(a+3)(a-3)=
c)(5+x)(5-x)=
d) (4a-2c)(4a+2c)=
e)(2x+1)(2x-2)=
f)(2y-5x)(2y+5x)=
g)(m+3n)(m-3n)=
h)(t-2z)(t+2z)=
i)(12a-x)(12a+x)=
Ajutor...dau !




Răspuns :

a)
[tex]x {}^{2} - 4[/tex]
b)

[tex]a {}^{2} - 9[/tex]
c)
[tex]25 - x {}^{2} [/tex]
d)
[tex]16a {}^{2} - 4c {}^{2} [/tex]
e) la acest subpunct , probabil este gresit ceva
f)
[tex]2y { }^{2} - 25x {}^{2} [/tex]
g)
[tex]m {}^{2} - 9n {}^{2} [/tex]

h)
[tex]t {}^{2} - 4z {}^{2} [/tex]

i)
[tex]144a {}^{2} - x {}^{2} [/tex]