Question

пожалуйста помогите))))))

Answer 1

$(v + s)(v - s) + (s + d)(s - d) = (v - d)(v + d) \\ {v}^{2} - {s}^{2} + {s}^{2} - {d}^{2}= (v - d)(v + d) \\ {v}^{2} - {d}^{2}= (v - d)(v + d) \\(v - d)(v + d)= (v - d)(v + d)$

верно