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In the select part I have too select “+” or “-“
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4 votes
In the select part I have too select “+” or “-“

In the select part I have too select “+” or “-“-example-1
User Mr Guliarte
by
5.2k points

1 Answer

5 votes

x--9=x+9
x+\text{ -9=x-9}
x-+9=x-9
x++9=x+9

This is because we know that


+*-=-,-*-=+,-*+=-\text{ and +}*+\text{ =+}

User Raab
by
5.2k points
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