Question

Resolva as equações a seguir determinando o valor da incógnita x
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Answer 1

a)2x-70=-10

2x=-10+70

2x=60

x=60/2

x=30

b)3[5x-2^2]=3

3[5x-4]=3

5x-4=3/3

5x-4=1

5x=1+4

5x=5

x=5/5

x=1

d)√81-3x=15

9-3x=15

-3x=15-9

-3x=6 ×(-1)

3x=-6

x=-6/3

x=-2