Question

A função y = x² – 2x – 3 corta o eixo da função em: *

Answer 1

y+?=x²-2x+?-3

x²-2x+1=(x-1)²1

y+?=x²-2x+1-3

1 1

y+1=x²-2x+1-3

a²-2ab+b²=(a-b)²

y+1=(x-1)²-3

y=(x-1)²-3-1

y=(x-1)²-4

-2x

y=x²+x-3x-3

x

y=x×(x+1)-3x-3

-3

y=x×(x+1)-3(x+1)

x+1

y=(x+1)×(x-3)

-x/y=0

0=x²-2x-3

x²-2x-3=0

-2x

x²+x-3x-3=0

x

x×(x+1)-3x-3=0

-3

x×(x+1)-3(x+1)=0

x+1

(x+1)×(x-3)=0

0 0

x+1=0

x-3=0

x

x=-1

x-3=0

x

x=-1

x=3

2

x1=-1,x2=3

-y,x=0

y=0²-2×0-3

y

y=-3

x E R

y'=d|dx(x²-2x-3)

d|dx(f+g)=d|dx(f)+d|dx(g)

y'd|dx(x²)+d|dx(-2x)-d|dx(3)

y'=2x+d|dx(-2x)-d|dx(3)

y'=2x-2-d|dx(3)

y'=2x-2-0

y'=2x-2