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a fost răspuns

f(x)=3x-5 Determinati numerele reale a, care verifica relatia f(a)+f(a+1)=10

Răspuns :

f(x)=3x-5
f(a)=3a-5
f(a+1)=3(a+1)-5=3a+3-5=3a-2
f(a)+f(a+1)=10
3a-5+3a-2=10
6a=10+7
6a=17
a=17/6€R

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