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Real Valued Functions

if fx=x2+3x...

Question

if $f (x) = x^{2} + 3 x$ then $f (4)$

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Solution

$f (x) = x^{2} + 3 x f (4) = 4^{2} + 4 (3) f (4) = 16 + 12 = 28$

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