Question

A={x∈Z/x²+x-6=0}

B={x∈Z/x²+3x-10=0}

A intersectat cu B =??

Va rog ajutati-ma cat mai repede!!

Answer 1

x^2+x-6=0
x^2+3x-2x-6=0
x(x+3)-2(x=3)=0
(x+3)(x-2)=0
x+3=0   x=-3
x-2=0    x=2
A apartine {-3,2}

x^2+3x-10=0
x^2+5x-2x-10=0
x(x+5)-2(x-5)=0
(x+5)(x-2)=0
x+5=0  x=-5
x-2=0   x=2
B apartine {-5,2}
A intersectat cu B  este 2