Cuántas diagonales tendría una figura de 8 lados?
2 answers:
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Minus both sides by 2m
Minus both sides by k
Divided both sides by 7
Minus both sides by k
Divided both sides by 7
The absolute value returns the "positive version" of a number.
In other words, if the number is positive, it remains positive; if the number is negative, it changes sign.
So, if we want , we want the "positive version" of x to be 9.
This can happen in two ways: if x is already 9, then its absolute value is still nine. If instead x=-9, its positive value will be 9 again.
In formula, we have
because