Question

(a + 3)(a + 7) =a (a + 3)-7​

Answer 1

Respuesta:

-4

Explicación paso a paso:

(a + 3)(a + 7) =a (a + 3)-7​

$a^{2} + 10a + 21$ = $a^{2} + 3a - 7$

7a = -28

a = -28/7

a= -4