Question

(7√2-3√3)(7√2+3√3) решите плииз

Answer 1

$\\bigg[(a-b)(a+b)=a^2-b^2bigg]\\\(7sqrt2-3sqrt3)(7sqrt2+3sqrt3)=(7sqrt2)^2-(3sqrt3)^2=49cdot2-9cdot3=\\=98-27=boxed{71}$