Question

Resolva pela forma de bhaskara

A] x² + x - 30 = 0

B] - 15x² - 2x + 13=0

C]2x² + 5x + 3 =0

D]x² - 4x - 12 =0

E] 2x² - 6x + 2 =0

F] x² - 3x - 4=0

G]2x² - 19x - 10 =0

H] -x² - 22x - 121 =0

Answer 1

a formula de bhaskara é ∆=b²-4ac
x²+x-30= a=1 b=1 c=-30
∆=1²-4(1)(-30)
∆=1+120
∆=121
x=-b+ou-√∆/2×a
x=-1+ou-√121/2×1
x1=-1+11/2=5
x2=-1-11/2=-6

b)∆=(-2²)-4(-15)×13. a=-15. b=-2 c=13
∆=4+780=784

×=-b+-√∆/2×a
x=2+-28/-30.
x1=2+28/-30=-1
x2=2-28/-30=2,93

c)∆=5²-4(2)(3). a=2. b=5. c=3
∆=25-24=1

x=-2+-√∆/2×a
x=-2+-1/4
x1=-2+1/4=-0,25
x2= -2-1/4=-1

d)∆=(-4²)-4(1)(-12). a=1. b=-4. c=-12
∆=16+48=64

x=4+-√64/2=x1=6 e x2=-2

e)∆=-6²-4(2)(2). a=2. b=-6. c=2m
∆=36-16=20

x=6+-√∆/2×a=6+-4,47/4=x1=2,61 e x2= 0,38

f)∆=-3²-4(1)(-4). a=1. b=-3. c=-4
∆=9+16=25

x=3+-5/2=x1=4 e x2=-1


g)∆=-19²-4(2)(-10). a=2. b=-19. c=-10
∆=361+80=441

x=19+-21/4=x1=10 e x2=-0,5


h)∆=-22²-4(1)(-10). a=-1. b=-22. c=-121
∆=484+40=524

x=22+-22,89/-2=x1=-22,44 e x2=0,445