Question

evidentiati cei trei factori in care se descompune sumele
 x^{2} y-4y=
 x^{2} y ^{2} z^{2} - y^{2}=
a^{3} -5a=

Answer 1

x²y- 4y=y(x²-4)= y(x-2)(x+2)

x²y²z² -y²= y²(x²z²-1)= y²(xz-1)(xz+1)

a³-5a=a(a²-5)= a(a-√5)(a+√5)