Question

dada a funçao f(x)=  x² +5x + 6 , calcule o x para que f(x)= 0 ??? 
 

Answer 1

x² +5x + 6 = 0
a = 1
b = 5
c = 6
delta = b²-4ac
delta = 5²-4.1.6
delta = 25-24
delta = 1
x = (-b+/-\/delta)/2a
x = (-5+/-\/1)/2.1
x = (-5+/-1)/2
x' = (-5+1)/2 = -4/2 = -2
x" = (-5-1)/2 = -6/2 = -3