32 divide by 7squared minus 3 squared

So we have 

Follow PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, and Subtraction.

So parentheses goes first. However, we have no parentheses so we must simplify the exponents first.



Now we simplify the denominator,


We can simplify this fraction by dividing 8 to the the numerator and denominator. 

32 ÷ 8 = 4
40 ÷ 8 = 5

Our new fraction is 4/5 which, in decimal form, is 0.8

Hope this helps! :)