Come valuti # 2x ^ {2} + 3x = 5 #?
Come valuti # 2x ^ {2} + 3x = 5 #? Risposta: #(x-1)(2x+5)=0# Spiegazione: #”rearrange equation into standard form”# #rArr2x^2+3x-5=0larrcolor(blue)”in standard form”# #”factor the quadratic using the a-c method”# #”the factors of – 10 which sum to + 3 are + 5 and – 2″# #2x^2-2x+5x-5=0larrcolor(blue)”split the middle term”# #color(red)(2x)(x-1)color(red)(+5)(x-1)=0larrcolor(blue)”factor by grouping”# #”take out a … Leggi tutto