Question

3) Resolva as seguintes equações do 2°grau:

a)
${x}^{2} - 7x = 0$
b)
${x}^{2} + 5x = 0$
c)
$4 {x}^{2} - 9x = 0$
d)
$3 {x}^{2} + 5x = 0$
e)
$4 {x}^{2} - 12x = 0$
f)
$5 {x}^{2} + x = 0$
g)
${x}^{2} + x = 0$
h)
$7 {x}^{2} - x = 0$
i)
$2 {x}^{2} = 7x$
j)
$2 {x}^{2} = 8x$
obrigada por responder ​

Answer 1

Resposta:

A=X²-7X=0

X(X-7)=0

X,=0

X-7=0

X,,=7

B)x²+5x=0

x(x+5)=0

X+5=0

X=-5

C)4x²-9x=0

4x(x-9)=0

4X=0

X=0/4

X,=0

x-9=0

X,,=9

D)3x²+5x=0

3x(x+5)=0

3x=0

x=0/3

x,=0

X+5=0

X,,=-5

E)4x²-12x=0

4x(x-12)=0

4x=0

x=0/4

x,=0

X-12=0

X=12

F)5x²+x=0

5x(x+1)=0

5X=0

x=0/5

X,=0

x+1=0

x,,=-1