Question

Tìm nghiệm của đa thức P(x)= 2x^2+x^2-4

Answer 1

\(P\left(x\right)=0\)

\(\Leftrightarrow2x^2+x^2-4=0\)

\(\Leftrightarrow3x^2-4=0\)

\(\Leftrightarrow3x^2=4\)

\(\Leftrightarrow x^2=\frac{4}{3}\)

\(\Leftrightarrow x=\pm\sqrt{\frac{4}{3}}\)

Answer 2

P(x)=3x^2=4

x=\(\pm\sqrt{\frac{4}{3}}\)

Hok tốt