Question

if f(x) = x2 – 5x + 7, evaluate f(2) – f(-1) + f(1/3). full answer plzz.

Answer 1

$f(x) = x {}^{2} - 5x + 7 \\ f(2) = 2 {}^{2} - 5 \times 2 + 7 \\ = 4 - 10 + 7 \\ = 1$
$f( - 1) = ( - 1) {}^{2} - 5 \times - 1 + 7 \\ = 1 + 5 + 7 \\ = 13$
$f( \frac{1}{3} ) = ( \frac{1}{3} ) {}^{2} - 5 \times \frac{1}{3} + 7 \\ = \frac{1}{9} - \frac{5}{3} + 7 \\ = \frac{1 - 15 + 63}{9} \\ = \frac{49}{9}$
$f(2) - f( -1 ) + f( \frac{1}{3} ) \\ = 1 - 13 + \frac{49}{9} \\ = \frac{9 - 117 + 49}{9} \\ = \frac{ - 59}{9}$

Answer 2

Answer:

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