Question

If f(x)=x 2 +5x+7,evaluate f(2)-f(-1)+f(1/3)

Answer 1

$Hello \: friend.....ur \: answer \: is \: here \\ \\ f(x) =x {}^{2} + 5x + 7 \\ \\ f(2) = 2 { }^{2} + 5 \times 2 + 7 \\ \\ f(2) = 21 \\ \\ similrly.... \\ \\ f( - 1) = 3 \: \: and \: f( \frac{1}{3} ) = \frac{79}{9} \\ \\ putting \: all \: values \\ \\ f(2) - f( - 1) + f( \frac{1}{3} ) \\ \\ = 21 - 3 + \frac{79}{9} \\ \\ = \frac{241}{9} \\ \\ I \: hope \: it \: is \: helpful \: for \: you$

Answer 2

Put x=2
F(2)= 4+10+7
=21
Put x=-1
F(-1)=1-5+7
=3areu
Put x=1/3
F(1/3)=1/9+5/3+7
On solving it we get
=79/9

Now, f(2)-f(-1)+f(1/3)
=21-3+79/9
=18+ 79/9
=18+8.7
=26.7
Hope it help