Question

Resolva as questões do segundo grau com bascara (Me ajudem pfv)

a) x²+X-6=0
b) x²-5x+3=0
c) 5x²-4x-1=0
d) 9x² - 12x + 4 =0
E) 6x² -6x -15=0
F) 3x² -11x -9 =0

Answer 1

Resposta:

a) x1=2 // x2= -3

c) x1= 1 // x2=-1/5

d) x1=2/3 // x2= 2/3

Explicação passo-a-passo:

a) a=1 / b=1 / c=(-6)

-b+/-V/2×a

= b^2-4×a×c

Vamos lá:

=1^2-4×1×(-6)

=1+24

=25

=5

-1+/-5/2×1

-1+/-5/2

x1=-1+5/2

x1=4/2=2

x2=-1-5/2= -6/2=-3

c)=(-4)^2-4×5×(-1)

=16+20

=36

=6

-(-4)+/-6/2×5

4+/-6/10

x1=4+6÷10

x1=10÷10

x1=1

x2= 4-6/10

x2=-2/10

x2= -1/10

d)=(-12)^2-4×9×4

=144-144

=0

0

-(-12)+/-0/2×9

12+/-0/18

x1=12+0/18

x1=12/18

x1=2/3

x2=12-0/18

x2=12/18

x2=2/3