f(x)=-x²+3 f(2)-f(3)=

F(2)=-2.-2+3 = 4+3=7
F(3)=-3.-3+3=9+3=12
F(2)-F(3)= 7-12 = -5
Kayanya siih.. maaf kalo salah

[tex]f(x) = - {x}^{2} + 3 \\ f(2) - f(3) = .... \\ \\ mencari \: f(2) \: dan \: f(3) \: \\ f(2) = - {x}^{2} + 3 \\ = - ( {2}^{2}) + 3 \\ = - 4 + 3 \\ = - 1 \\ f( 3) = - {x}^{2} + 3 \\ = - ( {3}^{2}) + 3 \\ = - 9 + 3 \\ = - 6 \\ \\ sehingga \: \\ f(2) - f(3) = - 1 - ( - 6) \\ = - 1 + 6 \\ = 5 \\ semoga \: membantu[/tex]