Question

resolva a equação x² - 2√5x + 4 = 0 em R​

Answer 1

∆=(-2√5)² -4.1.4 = (20) -16= 4 => √∆=2

x = -b±√∆/2a

x = 2√5±2/2

x' = 2√5+2/2 = 2(√5+1)/2 = √5 +1 ✓

x" = 2√5-2/2 = 2(√5-1)/2 = √5 -1 ✓