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I can't solve that, can anyone help me .?

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1 Answer

The thing that you need to do is order of operations so that it becomes easier to work with. For the first problem 

a = 8x5^2 -(3x4)^2 +7x2^3 get rid of the parenthesis parts first so:

a=8x5^2-12^2+7x2^2 then work on the squared part

a=8x25-144+7x8 remember that a negative squared is positive but since it is in parenthesis the negative will remain once the square is taken then do multiplication or division

a=200-144+56 then add or subtract in the order it is set

a=112

I hope this helps with the other two