tolong ya sekalian caranya

A(x) = -x² + 2x

B(x+1) = -x² + 2x
B(x+1) = - (x+1)² + 4(x+1) - 5
B( a ) = -a² + 4a - 5

B(x-1) = - (x-1) ² + 4(x-1) - 5
B (x-1) = -x² + 2x - 1 + 4x - 4 - 5
B(x-1) = -x² + 6x - 10