Curt A. | ALL Math, from Pre-Algebra to Partial Differential EquationsALL Math, from Pre-Algebra to Partial Di...

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What they are really asking you is for every value r that you are given. Substitute that vale for r in the given function F(r).. Pronounced the Function F of r.

F(r) = r^{2}+5 we know that r = x+1 soo now its called F at (x+1)<----->F(x+1)