Question

DETERMINE OS ZEROS OU AS RAIZES DE CADA UMDAS FUNÇÕES QUADRATICAS:
A) Y= X²-5X+4
B)Y=X²-4X=4
C)Y=X²-100
D)Y=3X²-6X

Answer 1

A) Y= X²-5X+4
Δ=(-5)²-4.1.4
Δ=25-16
Δ=9

X=-(-5)+-√9/2.1

X1=5+3/2=4
X2=5-3/2=1           S={4,1}


B)x²-4x+4
delta= (-4)² - 4*1*4 = 16- 16 delta=0
x1=x2
x= -(-4) /2
x=4/2
x=2


C)Y=X²-100

Δ=0²-4.1.100
Δ=0-400
Δ=-400

D)Y=3X²-6X
Δ=(-6)²-4.3.0
Δ=36-0
Δ=36

X=-(-6)+-√36/2.3

X1=6+6/6=2
X2=6-6/6=0/6    S={2,0/6}