Question

Xét đa thức P(x) = 2x+1/2

-Tính P(-1/4)

Answer 1

P\(\left(\dfrac{-1}{4}\right)\)= 2. \(\left(\dfrac{-1}{4}\right)\) + \(\dfrac{1}{2}\)

= \(\dfrac{-1}{2}\) + \(\dfrac{1}{2}\)

= 0

Answer 2

Thay x=\(\dfrac{-1}{4}\) vào đa thức P(x) ta có:

P(\(\dfrac{-1}{4}\)) = 2*\(\dfrac{-1}{4}\) + \(\dfrac{1}{2}\)

P(\(\dfrac{-1}{4}\)) = \(\dfrac{-1}{2}\) + \(\dfrac{1}{2}\)

P(\(\dfrac{-1}{4}\)) = 0