Question

Preciso de ajuda pra essas duas questões...

Answer 1

13)
x²-3x-4=0
(x -4) . (x +1)= 0
x'=4✓....x"= -1✓

x² + 8x + 16 = 0
(x +4)² = 0
(x+4) = 0
x = -4 ✓

14)
∆= 4² -4.5.(-1)= 16 +20= 36
xv= -b/2a = -4/10 = -2/5 ✓
yv = -∆/4a = -36/20 = -9/5 ✓

∆= (-7)² -4.(-1).15 = 49+60= 109
xv = -b/2a = 7/-2 = -7/2 ✓
yv = -∆/4a = -109/-4 = 109/4 ✓