Mohon bantuan nya mastah

jawab

f(x)  = x² + 3x + 7

f(x - 1) = ( x- 1)² + 3( x - 1) + 7
f(x- 1) = x² - 2x + 1 + 3x - 3  + 7
(x - 1) = x²  + x +  5