Question

Resolva essas 3 equações de 2°Grau

Answer 1

P)

x²+9=0

b²-4ac

9²-4*1*0

81-0

∆=81

-b±✓∆\2a

-9±✓81\2*1

-9+9/2 = 0

-9-9/2 = -18/2 = -9

{ 0 e -9 }

Q)3x²-8x=0

-8²-4*3*0

64-0

∆= 64.

-(-8)±✓64/2*3

8+8/6 = 16/6 → 8/3

8-8/6 = 0

{0, 8/3 }

R)

2x²-6x=0

-6²-4*2*0

36-0

∆=36

-(-6)±✓36/2*2

6+6/4 =3

6-6/4 = 0

{3,0}