Question

if f(x)=(x+1)(2x+1) find value of f(x)-f(x-1)

Answer 1

Step-by-step explanation:

f(x)=(x−1)(2x+1)

f(1)=(1−1)(2+1)=0

f(2)=(2−1)(4+1)=5

f(−3)=(−3−1)(−6+1)=(−4)(−5)=20