Come risolvi # x ^ 2 + 2x – 15 = 0 #?
Come risolvi # x ^ 2 + 2x – 15 = 0 #? Risposta: #x=-5″ or “x=3# Spiegazione: #”the factors of – 15 which sum to + 2 are + 5 and – 3″# #rArr(x+5)(x-3)=0# #”equate each factor to zero and solve for x”# #x+5=0rArrx=-5# #x-3=0rArrx=3#