simplify by using the order of operation

Mathematics
Tutor: None Selected Time limit: 1 Day

first exercises 4+2[9+(-4+12)]      second exercises 2^2-[3+9]  third exercises 5^2-[10+(8)]

Oct 6th, 2014

4+2[9+(-4+12)]  = 4 + 2[ 9 + 8 ]               Do  innermost brackets first 

                         =  4 + 2 * (17)                 remaining brackets  are calculated

                         =   4 + 34                        multiplication before addition 

                          = 38               

    second exercise  2^2- [3+9]     

                            = 4 - 12                  Do power and brackets       

                            = -8  

  third exercises      5^2-[10+(8)]  is like the second exercise

                             = 25 - 18                         (Is it meant to be 8 or -8? if -8 then it would be 2 here)

                             =7

Oct 6th, 2014

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