Question

determine algebricamente os zeros das funçôes: a)y= x²-9 x b) y= x²+5x+4​

Answer 1

sendo:

x²- 9x = 0

fatore

x * (x - 9) = 0

x1 = 0

x2 = 0

x²+5x+4​ = 0

delta

d = 25 - 16 = 9

as raízes

x1 = (-5 + 3)/2 = -1

x2 = (-5 - 3)/2 =-4