If $f (x) = 4 + \sqrt{x + 7}$ $f( x ) = 4+ \sqrt { x + 7}$ , then what is $f (9)$ $f(9)$ ?

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Answer 1 · 2017-11-19T02:49:27

8

Put 9 wherever you see $x$ $x$ :

$4 + \sqrt{9 + 7}$ $4+sqrt(9+7)$
$4 + \sqrt{16}$ $4+sqrt(16)$
$4 + 4$ $4+4$
$= 8$ $=8$

If f( x ) = 4+ \sqrt { x + 7} f(x)=4+√x+7f( x ) = 4+ \sqrt { x + 7} , then what is f(9)f(9)f(9)?