Question

Tính 2.[3.(-\(\sqrt{2}\)) + 1]²

Answer 1

\(2\left[3\left(-\sqrt{2}\right)+1\right]^2=2\left(1-3\sqrt{2}\right)^2=2\left(-17-6\sqrt{2}\right)=-34-12\sqrt{2}\)

Answer 2

\(2\cdot\left(-3\sqrt{2}+1\right)^2\)

\(=2\cdot\left(19-6\sqrt{2}\right)\)

\(=38-12\sqrt{2}\)