Question

ae giúp mình bài 9 với ạ

Answer 1

9a.

Do \(P\left(-2\right)=7\)

\(\Rightarrow a.\left(-2\right)+5=7\)

\(\Rightarrow-2a=2\)

\(\Rightarrow a=-1\)

b.

Do \(P\left(0\right)=-2\)

\(\Rightarrow a.0+b=-2\)

\(\Rightarrow b=-2\)

Do \(P\left(-3\right)=-1\)

\(\Rightarrow a.\left(-3\right)+b=-1\)

\(\Rightarrow-3a-2=-1\)

\(\Rightarrow-3a=1\)

\(\Rightarrow a=-\dfrac{1}{3}\)