Question

ajuda pfvr, tenho aue entregar hj!⚠️

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Answer 1

Resposta:

Explicação passo-a-passo:

a)3x+15x=100

  18x=100  

          100       50  

      x= ------ = -----

           18         9

b) 3x+2=x-15

   3x-x=-15-2

   4x=-17

    x=-17

        -----

           4

c) 3x-2=15x+30

   3x-15x=30+2

   -12x= 32 x(-1)

    12x=-32

        x=-32    -16      -8

            -----= ----- = -----

             12      6         3

Answer 2

1.

a)

$3x-9=0\ \therefore\ 3x=9\ \therefore\ x=\dfrac{9}{3}\ \therefore\ \boxed{x=3}$

b)

$15x+40=100\ \therefore\ 15x=100-40\ \therefore\ 15x=60\ \therefore\\\\ x=\dfrac{60}{15}\ \therefore\ \boxed{x=4}$

c)

$3x+2=2-3x\ \therefore\ 3x+3x=2-2\ \therefore\ 6x=0\ \therefore\ \boxed{x=0}$

2.

$2x^4+4x-5\\\\ x=3\ \therefore\ 2(3)^4+4(3)-5=2(81)+12-5=162+7=\boxed{169}$