Resposta :
Resposta:
a) a = 1; b = -3; c = -4
Δ=(-3)²-4×1×(-4)
Δ = 9+16
Δ = 25
b) a = 5; b = 4; c = -1
Δ=4²-4×5×(-1)
Δ = 16+20
Δ = 36
c) a = 1; b = 8; c = 16
Δ=8²-4×1×16
Δ = 64-64
Δ = 0
d) a = 1; b = -7; c = 15
Δ=(-7)²-4×1×15
Δ = 49-60
Δ = -11
e) a = 9; b = -6; c = 1
Δ=(-6)²-4×9×1
Δ = 36-36
Δ = 0
f) a = 4; b = -2; c = 1
Δ=(-2)²-4×4×1
Δ = 4-16
Δ = -12
g) a = 1; b = -1; c = -12
Δ=(-1)²-4×1×(-12)
Δ = 1+48
Δ = 49
h) a = 6; b = 1; c = -1
Δ=1²-4×6×(-1)
Δ = 1+24
Δ = 25