Respuesta :

(7x-2)(7x+7)

=(7x)²+49x-14x-14

=7²x²+35x-14

=49x²+35x-14
eah
(7x - 2)(7x + 7)
= 7x * 7x + 7x * 7 - 2 * 7x - 2 * 7
= 49x² + 49x - 14x - 14
= 49x² + 35x - 14