Jika f(x+11)=(x-12)(x+13), maka nilai dari f(21) adalah…..

F(21) = f(x + 11)
21 = x + 11
10 = x
___________
f(21) = (10 – 12)(10 + 13)
f(21) = -2 x 23
f(21) = -46 ( D )

Semoga Bermanfaat
Thank You ^_^/