Question

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Answer 1

Resposta:

c)

10x-3x=21

7x=21

x=3

d)

|4x    2|   =  |2x   3|

|-8    1|      | 4   1|

4x+16=2x-12

2x=-28

x=-14

e)

4(x+2)-3*(2x-1)=3x-16

4x+8-6x+3=3x-16

-2x+11=3x-16

-5x=-27

x=27/5

f)

|7   x   |  =  | 4   3 |

|x    6  |     | 10  4 |

42-x²=16-30

-x²=16-30-42

-x²= -56

x²=56

x=±√56

x=±2√14