Question

ayudaaaaaaaaaaaaaaaaa doy corona

Answer 1

Respuesta:

Explicación paso a paso:

1)  (5x²-7x-8)+(-3x-9)= 5x²-7x-8-3x-9

=5x²-10x-17

2) (4a²+2ab+5b)+(6a²-7ab) = 4a²+2ab+5b+6a²-7ab

=10a²-5ab+5b

3)(-15mn²+6m²n-9m)+(-13m²n-2m+3)=-15mn²+6m²n-9m-13m²n-2m+3

=-7m²n-15mn²-11m+3