Question

1.Determine, se existirem, os zeros das funções quadráticas

a) f (x)= 2x²-3x+5
b) f (x)= x²-5x+6
c) f (x)= 5x²+10x+5
d) f (x)= x²-8x+16
e) f (x)= x²-2x
f) f (x) = 2x²+8x
g) f (x)= x²-16
h) f (x)= x²-11
i) f (x)= x²+14x
j) f (x)= 3x²+3x
k) f (x)= 2x²-8
l) f (x)= -x²+36

Answer 1

Boa tarde 

a) f (x)= 2x²-3x+5 ⇒ nâo tem raiz real 

b) f (x)= x²-5x+6 ⇒ x1 = 2, x2 = 3

c) f (x)= 5x²+10x+5 ⇒ x1 = x2 = -1

d) f (x)= x²-8x+16 ⇒ x1 = x2 = 4 

e) f (x)= x²-2x ⇒ x1 = 0. x2 = 2

f) f (x) = 2x²+8x ⇒ x1 = 0, x2 = -4

g) f (x)= x²-16 ⇒ x1 = 4, x2 = -4 

h) f (x)= x²-11 ⇒ x1 = √11, x2 = -√11

i) f (x)= x²+14x ⇒ x1 = 0, x2 = -14

j) f (x)= 3x²+3x ⇒ x1 = 0, x2 = -1

k) f (x)= 2x²-8 ⇒ x1 = -2, x2 = 2

l) f (x)= -x²+36 ⇒ x1 = 6, x2 = -6