Question

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 !

Answer 1

a)
$x {}^{2} - 4$
b)

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

h)
$t {}^{2} - 4z {}^{2}$

i)
$144a {}^{2} - x {}^{2}$