Question

Sebuah fungsi f didefinisikan dgn rumus. f(x)=x²-4x. nilai f(a+3)=?

Answer 1

F(x) = x² - 4x
f(a+3) = (a+3)² - 4(a+3)
           = a² + 6a + 9 - 4a -12
           = a² + 2a - 3

Answer 2

F(a+3) = x(a+3)²-4(a+3)
= a²+6a+9-4a-12
= a²+2a-3
= (a+3) (a-1)