Question

resolva as equacoes
$2 x^{2} -10x+1=0$
$x^{2} -7x+10=0$
$3 x^{2} -14x+2p=0$
coloque o resultado e a conta

Answer 1

Oi Francisco

a)

2x² - 10x + 1 = 0

delta
d² = 100 - 8 = 92
d = √92

x1 = (10 + √92)/4 
x2 = (10 - √92)/4 

b)

x² - 7x + 10 = 0

delta
d² = 49 - 40 = 9
d = 3

x1 = (7 + 3)/2 = 10/2 = 5
x2 = (7 - 3)/2 = 4/2 = 2

c)

3x² - 14x + 2 = 0

delta
d² = 14² - 4*3*2 = 196 - 24 = 172 
d = 2√43 

x1 = (14 + 2√43)/6 = (7 + √43)/3
x2 = (14 - 2√43)/6 = (7 - √43)/3