Question

Find the maximum value of:

a) \(-3x^2-9x-25\)

b) \(x-x^2\)

c) \(-x^2+7x+12\)

Answer 1

a: \(=-3\left(x^2+3x+\dfrac{25}{3}\right)\)

\(=-3\left(x^2+3x+\dfrac{9}{4}+\dfrac{73}{12}\right)\)

\(=-3\left(x+\dfrac{3}{2}\right)^2-\dfrac{73}{4}< =-\dfrac{73}{4}\)

Dấu '=' xảy ra khi x=-3/2

b: \(=-\left(x^2-x+\dfrac{1}{4}-\dfrac{1}{4}\right)=-\left(x-\dfrac{1}{2}\right)^2+\dfrac{1}{4}< =\dfrac{1}{4}\)

Dấu '=' xảy ra khi x=1/2

c: \(=-\left(x^2-7x-12\right)\)

\(=-\left(x^2-7x+\dfrac{49}{4}-\dfrac{97}{4}\right)\)

\(=-\left(x-\dfrac{7}{2}\right)^2+\dfrac{97}{4}< =\dfrac{97}{4}\)

Dấu '=' xảy ra khi x=7/2