Question 711178
-9[6+9(-1+9)]+18
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Start with what is inside the innermost parentheses first:
-9[6+9(8)]+18
Then go up to the next level of parentheses (in this case written as brackets). Note that multiplication has a higher order of precedence than addition, so do that first:
-9[6+72]+18
-9[78]+18
Again, multiply before you add (this is where you went wrong):
-702+18
Finally:
{{{highlight(-684)}}}
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Good Luck,
tutor_paul@yahoo.com