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
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
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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