Question

Dada a função f(x) = -x² + 5x + 6, calcule quando possível:

a) f(-1)

b) f(√2)

c) f(-4/5)

Answer 1

$f(x)=-x^2+5x+6$
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$a)\\\\f(-1)=-1-5+6=0$

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$b)\\\\f(\sqrt{2})=-2+5\sqrt{2}+6=4+5\sqrt{2}$

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$c)\\\\f(\frac{-4}{5})=-\frac{16}{25}+5.\frac{-4}{5}+6=\frac{34}{25}$

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