Question

help me plsss guy

Answer 1

\(P=x^4+2x^2+1+x^4+2x^3+x^2-3\)

\(P=2x^4+2x^3+3x^2-2\)

\(P=x^2\left(2x^2+2x+3\right)-2=\dfrac{1}{2}x^2\left[\left(2x+1\right)^2+5\right]-2\ge-2\)

\(P_{min}=-2\) khi \(x=0\)