Mathematics
Senior High
因数分解の問題です。38のやり方を教えて欲しいです。2行目の1つ目のカッコの前にマイナスをつける理由がわからないです。教えてください。
□38 次の式を因数分解せよ。
x²-ax-6x+3a+9
• (-x + 3) a + x² -6279
= -x + 3) a +(2(-3)²
s ( 2 ~ 8) ₁. + ( x
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