Are parenthesese necessary in the expression 2+(3 x 5)?
Are parenthesese necessary in the expression (2+3)x5?
can you explain?
yes, parenthesis are necessary. why? following order of operations, -PEMDAS- parenthesis come first. this is telling you in the first problem that 3 is first multiplied by 5 to get 15, and then you add 2 to 15. =17
for the second one, first you have to add 2 and 3 to get 5, then multiply it by 5. without the parenthesis on either expression, it would not matter which calculations you did first, and you would get a different answer than with parenthesis.
the parenthesis are just telling you what to do first, so it's very necessary