Give two examples that show how using parentheses can change the order in which operations are performed in an expression.

Parenthesis indicate which part of the equation is to be done first, see PEMDAS. For example, 3(5-2)-4=5, but 3*5-(2-4)=17

1,
3 + 4 * 6 = 3 + 24 = 27    ( using PEMDAS  which says multiply before add))

To do the addition first we put parentheses around the 3 + 4:-

(3 + 4) * 6  = 7*6 = 42

2.
 6 + 8 / 4   = 6 + 2 = 8

If we put parentheses around the 6 and 8 :-

(6 + 8) / 4   
 = 14/4
= 3.5

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