Respuesta :
2a * a + 2a * -4 - 7 * a - 7 * -4 Use the FOIL method
2a^2 - 8a - 7a + 28 Combine like terms
2a^2 - 15a + 28
Hope this helps
2a^2 - 8a - 7a + 28 Combine like terms
2a^2 - 15a + 28
Hope this helps