Question

Please help with solution needed!!

Answer 1

42,640

Explanation:

`205 * 208 = (200 + 5)(200 + 8) \\ formula \: to \: be \: used \: \\ \red{ \boxed{ \bold{(x + a)(x + b) = {x}^(2) + (a + b)x + ab}}} \\ \\ \implies \: 205 * 208 \\ \\ = (200 + 5)(200 + 8) \\ \\ = {(200)}^(2) + (5 + 8)(200) + (5)(8) \\ \\ = 40000 + (13)(200) + 40 \\ \\ = 40000 + 2600 + 40 \\ \\ = 42,640`