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A(2,-3), f:R-R, f(x)=-2x+b.Aflati valoarea reala a si b.




Răspuns :

f : R ⇒ R
f(x) = -2 * x + b
A ( 2 , - 3 ) ⇒ f(2) = - 3

f(2) = - 2 * 2 + b = - 4 + b 
f(2) = -3

-4 + b = - 3
b = - 3 + 4
b = 1

V: f(2) = -2 * 2 + 1 = - 4 + 1 = - 3 ( A )