jika f(x)=x+1 maka f(x²)-2 f(x)=

[tex]f(x) = x + 1 \\ f( {x}^{2}) = {x}^{2} + 1 \\ f( {x}^{2} ) - 2f(x) \\ = {x}^{2} + 1 - 2(x + 1) \\ = {x}^{2} + 1 - 2x - 2 \\ = {x}^{2} - 2x + 1 - 2 \\ = {x}^{2} - 2x - 1[/tex]
Semoga dapat dipahami