Question

Formula de bhaskara a x2-4x-5=0

Answer 1

x²-4x-5
Δ: b² - 4 · a · c
Δ:16 -4 · 1 · (-5)
Δ:16+20
Δ:36 ⇒ √36 ⇒ 6

-b +- √Δ ÷ 2 · a

x' : 4+6 / 2
x' : 5

x'': 4-6/ 2
x'': -1

Answer 2

x²-4x-5=0
Δ= b²-4ac
Δ=16+20
Δ=36

x= -b+-√Δ
         2a
x¹= 4+ 6 = 10 = 5
        2.1    2    

x²= 4-6 = -2 = -1
      2.1     2