Come valutate e risolvete # 2x ^ 2 + x - 1 = 0 #?

#2x^2+x-1=0#

Fattorizza.

#2x^2+2x-x-1=0#

#2x(x+1)-1(x+1)=0#

#(2x-1)(x+1)=0#

#2x-1=0# or #x+1=0#

#x=1/2# or #x=-1#