Question

Exercitiul 7,imi trebuie urgenttt
dau coronita

Answer 1

7.
a)x³-2³=(x-2)(x²+2x+4)
Formula de calcul prescurtat folosita este : a³-b³= (a-b)(a²+ab+ b²)
b)x³-3³=(x-3)(x²+3x+9)
c)2³a³+5³b³=(2a+5b)(4a²-10ab+25b²)
Formula de calcul prescurtat folosita este : a³+b³ = (a+b)(a²-ab+b²)
d)a³-4³b³=(a-2b)(a²+4ab+16b²)
e)(x+1-x+1)(x²+2x+1+x²-1+x²-2x+1)=2(3x²+1)
f)(3x-1+2x+1)(9x²-6x+1-6x²-x+1+4x²+4x+1)=5x(7x²-3x+3)
g)(5x-1-2x-1)(25x²-10x+1+10x²+3x-1+4x²+4x+1)=(3x-2)(39x²-3x+1)