Mathematics
Senior High
Solved
2行目から3行目に行くまでが分かりません!
途中式を教えて欲しいです🙇🏻
(2) (与式)=
I+1S (I+1 3+1)
(x+3)(x-3)+x(x+3)
=(左
x-3(x-3)(x)(S-x)
1+x(x+3)(x-3)+x) (1-x)
(左
S+x-2x+9+XXI-x)
x(x+3)(x-3)
Answers
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ありがとうございます!