Question

Giúp mk vs nha

Answer 1

Có P(x)=ax^2+2x+1

=>P(1/2)=a.(1/2)^2+2.1/2+1

P(1/2)=a.1/4+1+1

P(1/2)=1/4a+2

 mà P(1/2)=1

=>1/4a+2=1

=>1/4a=-1

=>a=-4

Vậy a=-4

Answer 2

\(P\left(x\right)=ax^2+2x+1\Rightarrow P\left(\dfrac{1}{2}\right)=a.\left(\dfrac{1}{2}\right)^2+2.\dfrac{1}{2}+1=1\Leftrightarrow\dfrac{1}{4}a+1+1=1\Rightarrow a=-4\)