Question

Vreau doar A) B) C) D) E) F)
dau coroana cel care face cel puțin 3.

Answer 1

a)(x+1)(x-1)
b)(x+3)(x-3)
c)(5+x)(5-x)
d)(2a+x)(2a-x)
e)(6x+3y)(6x-3y)
f)(2/3x+1/2)(2/3x-1/2)

Answer 2

3.a)x²-1=(x+1)(x-1)
b)x²-9=(x-3)(x+3)
c)25-x²=(5-x)(5+x)
d)4a²-x²=(2a-x)(2a+x)
e)36x²-9y²=(6x-3y)(6x+3y)
f)4/9x²-1/4=(2/3x-1/2)(2/3x+1/2)
g)25/9x²-1/25=(5/3x-1/5)(5/3+1/5)
h)9a²-4b²=(3a-2b)(3a+2b)
i)a⁴-b⁴=(a²-b²)(a²+b²)
j)81x²-1/49=(9x-1/7)(9x+1/7)
k)169x²-64=(13x-8)(13x+8)
l)2,25a²-1,21b²=(1,5a-1,1b)(1,5a+1,1b)
m)1,44x²-0,25y²=(1,2x-0,5y)(1,2x+0,5y)
n)16/625x⁴-81=(4/25x²-9)(4/25x²+9)
o)(x+2)²-1=(x+2-1)(x+2+1)=(x+1)(x+3)