Question

Solve (v5-v7) (v5+v7) by the identity used by Anil.​

Answer 1

Answer:

$(a + d)(a - d) = {a}^{2} - {d}^{2} \\ ( \sqrt{5} - \sqrt{7} )( \sqrt{5} + \sqrt{7} ) = { \sqrt{5} }^{2} - { \sqrt{7} }^{2} \\ = 5 - 7 \\ - 2$