Mathematics
Junior High
この(2)の答えって-25+4aの2乗でも正解になりますか?
ーよ。
-4
2
4a
(2) (5+2a) (−5+2a)
=(2a)²-5²
=4a²-25
4a²-25
(5) (x-2y) (x+2y)
=x²-(2y)²
=x²-4y²
²-471²
P
(3) (-2x-5)
=(-2x)
=4x²-2
(6) (xy-22) (
= (xy)²_
= x²y²-
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