Question

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Answer 1

Răspuns:

1. x-4=3²

x-4=9

x=9+4

x=13

2. -2x+6=2⁴

-2x+6=16

-2x=16-6

-2x=10

x=10:(-2)

x=-5

3. -x+5=x-1

-x-x=-1-5

-2x=-6

x=-6:(-2)

x=3

4. 2x-3=(x-3)²

2x-3=x²-6x+4

x²-8x+7=0

x²-x-7x+7=x(x-1)-7(x-1)=(x-1)(x-7)

x-1=0

x=1

x-7=0

x=7

5. 3x-9=x-3

2x=6

x=6:2

x=3