Oblicz wartości liczbowe sum(najpierw zredukuj wyrazy podobne):
a) 2a+3-a+6+7a dla a= -2
b) n*+n-7+3n*-n+16 dla n= -1/2
* = do kwadratu
-1/2 = - jedna druga
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a)8a+9=(-2)x8+9=-16+9=-7
b)4n*+9=1+9=10
a) 2a +3 -a +6 +7a = 8a +9 = 8*(-2) +9= -16 +9 = -7
b) n^2 +n -7 +3n^2 -n +16 = 4n^2 +9 = 4*(-1/2)^2 +9 = 4*1/4 +9 = 4/4+9= 1+9 = 10