Question

Calcule as raízes das seguintes funções:
a) y = 3x - 1
b) y = -x +5
c) y = 2x² - 5x + 3
d) y= -x²+x+6
e) y = x² +10x + 25​

Answer 1

Explicação passo-a-passo:

y=3x-1

0=3x-1

0-3x=-1

-3x=-1(-1)

3x=1

x=1/3

y=-x+5

0=-x+5

0+x=5

x=5

2x²-5x+3=0

a=2

b=-5

c=3

∆=b²-4ac

∆=(-5)²-4*2*3

∆=25-24

∆=1

-b±√∆/2a

5±√1/2*2

5±1/4

x¹=5+1/4=6/4(÷2)=>3/2

x²=5-1/4=4/4=>1

-x²+x+6=0

a=-1

b=1

c=6

∆=b²-4ac

∆=1²-4*-1*6

∆=1+24

∆=25

-b±√∆/2a

-1±√25/2*-1

-1±5/-2

x¹=-1+5/-2=4/-2=>-2

x²=-1-5/-2=-6/-2=>3

x²+10x+25=0

(x+5)²=0

x+5=0

x=0-5

x=-5