Evaluate the algebraic expressions with no decimal answer
1. N^2 - 25 a)when n=-10 b)when n= -5 c)when n=1/2 d)when n=9
2. (-7d+14)/2 a)when d=2 b)when d=-2 c)when d=6/7 d)when d=4
3. 2x^-2 - x a)when x=2 b)when x=-1 c)when x=1/4
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