Question

若x∧2+x-1=0则2∧5+2x∧4－x∧3－2x+11＝

Answer 1

X^2+X-1=0,

原式=2X^3(X^2+X-1)+X^3-2X+11

=X^3-2X+11

=X(X^2+X-1)-X^2-X+11

=-(X^2+X-1)+10

=10.