marlisamoore
marlisamoore
17-08-2017
Mathematics
contestada
can someone help me with this question
Respuesta :
zrh2sfo
zrh2sfo
17-08-2017
The answer is A; 25x²-9
(
5x
+3
)
(
5x
−3
)
=
(
5x
+3
)
(
5x
+
−3
)
=
(
5x
)
(
5x
)
+
(
5x
)
(
−3
)
+
(3)
(
5x
)
+
(3)
(
−3
)
=
25
x
²−15x+15x−9
=
25
x
²−9
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