Respuesta :
Answer: =
x
2
−
4
x
−
21
Step-by-step explanation: (
x
+
3
)
.
(
x
−
7
)
=
(
x
)
.
(
x
−
7
)
+
(
3
)
.
(
x
−
7
)
ANSWER
x^2-4x-21
EXPLAIN
First expand the brackets by multiplying the number from the first bracket to the second bracket
you will get this = x^2 + 3x- 7x- 21 ,then u collect the like terms which is (3x & -7x).
your answer ( x^2 - 4x - 21 ).