Question

RESOLVA AS EQUAÇÕES DE 2o GRAU:
a) x2-5x+6=0
b) x2-8x+12=0
c) x2+2x-8=0
d) x2-5x+8=0

Answer 1

Resposta:

a) a=1

b=-5

c=6

achar o delta:

∆=(-5)² - 4 x 1 x 6

∆= 25 - 24

∆= 1

achar baskara:

x= - ( - 5 ) + - ✓1

-------------------

2 x 1

x= 5 + - 1

--------

2

achar x' e x":

x'= 5 + 1

-------

2

x'= 6

---

2

x'= 3

x"= 5 - 1

-----

2

x"= 4

---

2

x"= 2

letra a) 3, 2

letra b) a=1

b=-8

c=12

achar o delta:

∆=(-8)² - 4 x 1 x 12

∆=64 - 48

∆=16

achar baskara:

x= -(-8) + - ✓16

----------------

2 x 1

x= 8 + - 4

---------

2

achar x'e x":

x'= 8+4

-----

2

x'= 12

----

2

x'= 6

x"= 8-4

-----

2

x"= 4

---

2

letra b): 6, 2