Respuestas

2013-11-24T06:04:45+01:00
1. (a + 2)(a + 3) = a² + a (2 + 3)+(2)(3)= a² + 5a + 6
2. (x + 5)(x + 4) = (x)² – x (5 + 4) + (5)(4)= x² + 9x + 20
3. (t + 2)(t - 3) = t² + t (2 – 3) + (2)(-3)= t² - t - 6