Question

1*) Determine o zero da função :

Exemplo

a) f (x) = x^2 - 11 + 30


a = 1
b = -11
c = 30

/\ = b^2 - 4 ac
/\ = ( -11 )^2 - 4 . 1 . 30
/\ = 121 - 120
/\ = 1 #

_
x = - b + - V /\ / 2 a
x = 11 + 1 / 2
x = 12 / 2 ----> x = 6
x = 11 - 1 / 2
x = 10 / 2
x = 5 #




b) f (x) x^2 - 121



c) f (x) x^2 - 5x

Answer 1

b)x^2-121=0
x^2=121
x=raíz de 121
x=11

c)(-5)^2-4(1)(0)
25-0
delta=25

x=-(-5)+-raíz de 25/2a
5+-5/2

x'=10/2=5
x''=0/2=0