Question

mng giúp e với, e cảm ơn ạ

Answer 1

\(P=-2\left(x^2-\dfrac{2.3}{2}x+\dfrac{9}{4}-\dfrac{9}{4}\right)+9=-2\left(x-\dfrac{3}{2}\right)^2+\dfrac{27}{2}\le\dfrac{27}{2}\)

Dấu ''='' xảy ra khi x = 3/2