Respuesta :


x
=
−
7
or
x
=
−
8

Explanation:
Find a pair of factors of
56
with sum
15
.
The pair
7
,
8
works in that
7
⋅
8
=
56
and
7
+
8
=
15

Hence:
0
=
x
2
+
15
x
+
56
=
(
x
+
7
)
(
x
+
8
)

So:
x
=
−
7
or
x
=
−
8


Alternative method
The answer is 2 your welcome

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