Question

3) Usando a formula de Baskará resolva as equações
a) x2 - 2x + a:o
b) 4x2 + 8x+6=0
c) x2 - 10x + 25 = 0
d) x²-3x - 4=0 ​

Answer 1

c) x2 - 10x + 25 = 0
Δ = b2 - 4ac
Δ = -(-10)2 - 4 . 1 . 25
Δ = 100 - 100
Δ = 0
x = - b +- √Δ / 2a
x = 10/2 = 5


d) x2 - 3x - 4 = 0
Δ = b2 - 4.a.c
Δ = (-3)2 - 4 . 1 . (-4)
Δ = 9 + 16 = 25
x = - b +- √Δ / 2a
x= -(-3) +- √25 / 2
x= 3 +- 5 / 2
x1 = 8/2 = 4
x2 = -2/2 = -1