Question

com a formula,resolva as seguintes equações
d)-x² +8 x+9 =0
e)2x² +3 x +11=0
f)25x² - 10x +1=0

Answer 1

║d)-x² +8x+9 =0
Δ = b² -4ac
Δ8² -4.(-1).9
Δ =64 -36
Δ =28

e)2x² +3x+11=0
Δ = b² -4ac
Δ =3² -4.2.11
Δ = 9 - 88
Δ = -79
Δ = √-79
Δ = ∅

f) 25x² -10x +1 =0
Δ = b² -4ac
Δ = (-10)² -4.25.1
Δ = 100 - 100
Δ =0

x₁ = -b + √Δ = 10 +0  =10∵²    5∵₅   1
      ║2a         ║ 2.25  ║50∵²║25∵₅║5