Question

[Dương Tuấn mINH]

tim min,max neu co:

a , A=x²+4x-6

b, B=|2x-1|+|2x-7|-10

Answer 1

[Chesy]

\(x^2+4x-6=\left(x+2\right)^2-10\ge0-10=-10\Rightarrow A_{min}=-10\Leftrightarrow x=-2\) 

\(B=|2x-1|+|7-2x|-10\ge|2x-1+7-2x|-10=6-10=-4.\Rightarrow B_{min}=-4\Leftrightarrow\frac{1}{2}\le x\le\frac{7}{2}\)