Question

X elevado a 2 menos 6x mais nove igual a zero

Answer 1

x^2-6x+9=0
delta=b^2-4ac
delta=(-6)^2-4.1.9
delta=36-36
delta=0
x=-b-/+ raiz de delta/2a
x=-(-6)-0/2.1
x=6-0/2
x=6/2
x=3

Answer 2

x²-6x+9=0
Δ= b²-4ac
Δ= (-6)² - 4(1)(9)
Δ= 36 - 36= 0

x= - b +-√Δ/ 2a
x= 6 +-0/ 2

x'= 6+0/2 =>3
x''= 6-0/2 => 3