Question

me ajudem a resover isso por favor​

Answer 1

Resposta:

Explicação passo a passo:

9)

a)2x+10=50 ---> 2x=50-10---> 2x=40 ---> x=40/2 ---> x=20

b)4+3x=25 ---> 3x=25-4 --> 3x=21---> x=21/3 ---> x=7

c)-6+10x=94 ---> 10x=94+6 --> 10x=100 ---> x=100/10 --> x=10

d)6x+10=x+50 --> 6x-x=50-10 --> 5x=40 --> x=40/5 --> x=8

10)

a)2x^2=18---> 2x^2=2.3^2---> X=3

b)x^2-4=12---> x^2=16---> x^2=4^2----> x=4

c)2x^2+4x-6=0 (/2) ---> x^2+2x-3=0

-b=x1+x2 ---> -2=x1+x2

a.c=x1*x2---> -3=x1*x2

x1=1       x2=-3

d)-x^2+3x+0 (*-1)----> x^2-3x+0

-b=3= x1+x2

a.c=0= x1.x2

x1=3    x2=0