Question

дана функция f(x) =(1+2x)(2x-1) найти f'(0,5)

Answer 1

f(x)=2x-1+4x²-2x=4x²-1
f`(x)=8x
f`(0,5)=4

Answer 2

f(0.5)=(1+2*0.5)(2*0.5-1)
f(0.5)=(1+1)(1-1)
f(0.5)=2*0
f(0.5)=0
x=0