jika f(x)=-x+3 maka f(x²)+f²(x)-2f(x)=

[tex] f(x)=-x+3 \\ f( {x}^{2} ) + {f}^{2} (x) - 2.f(x) \\ = - {x}^{2} + 3 + {( - x + 3)}^{2} - 2( - x + 3) \\ = - {x}^{2} + 3 + ( {x}^{2} - 6x + 9) + 2x - 6 \\ = - {x}^{2} + 3 + {x}^{2} - 6x + 9 + 2x - 6 \\ = - 4x + 6[/tex]