Question

x ao quadrado menos 7x + 10 = 0

Answer 1

x²-7x+10=0    x1=7+3/2=10/2=5
Δ=(-7)²-4.1.10 x2=7-3/2=4/2=2      solução (2,5)
Δ=49-40
Δ=9

Answer 2

x² - 7x + 10 = 0

a= 1
b= -7
c= 10

△= b² -4ac
△= (-7)² -4•1•10
△= 49 - 40
△= 9

x= -b+-√△/2a
x= -(-7)+-√9/2•1
x= 7+-3/2
x'= 7+3/2 = 10/2 = 5
x"= 7-3/2 = 4/2 = 2

S= { 5,2 }