Question

Tim GTNN cua P :

P=\(x^4-8x^3+27x^2-44x+23\)

Answer 1

\(P=x^4-8x^3+24x^2-32x+16+3x^2-12x+12-5\)

\(P=\left(x-2\right)^4+3\left(x-2\right)^2-5\ge-5\)

\(\Rightarrow P_{min}=-5\) khi \(x=2\)

Answer 2

trả lời :

P=x⁴ - 8x³ + 27x² - 44x +23

P= (x-2)⁴ + 3(x-2)² - 5 ≥ 5

P_{min= -5 khi x = 2}

các bn tham khảo thôi nha (cs khi sai ráng chịu)