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Answer
When
,
.
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To find the value of the expression
when
, you simply substitute
for
. This gives you:
So, the value of the expression is
.
If you’re ever unsure about substituting values, a good tip is to break it down step by step: first, calculate
, then subtract
. It’s also a common mistake to forget the order of operations, but in this case, the straightforward arithmetic keeps it simple!