Respostas

2013-12-05T00:05:08-02:00
X² -20x + 64 = 0

a = 1
b = -20
c = 64

Δ= b² -4.a.c
Δ = (-20)² -4.1.64
Δ = 400 - 256
Δ = 144

-b +-√Δ / 2a = 

-(-20) + √144 / 2 = 
20 + 12 / 2 =
32/2 =
16

-(-20) - √144 / 2 = 
20 - 12 / 2 = 
8/2 = 
4

hipotenusa:

h² = 4² + 16²
h² = 16 + 256
h² = 272
h = √272

fatora:

272/2
136/2
68/2
34/2
17/17
1

2² . 2² . 17 = 

2.2.√17 = 
4√17

hipotenusa: 4√17