Question

qual resutao montado de x2-7x+10=0

Answer 1

a = 1
b = 7
c = 10 

Δ = b² - 4 . a .c 
Δ = 7² - 4 .1 . 10 
Δ = 49 - 40 
Δ = 9 

x = - b +- (√Δ) /2.a
x = - (-7) +- (√9) /2.1
x = 7 +- 3/ 2

x1 = 7 + 3 /2
x1 = 5

x2 = 7 - 3 /2
x2 = 2

S= {5,2}