因数分解L3-1-1(8問)
次の式を因数分解せよ。
x2-2x-168
解答○ ×a2+18a+72
解答○ ×a2-21a+108
解答○ ×x2+2x-288
解答○ ×x2-4xy-192y2
解答○ ×a2+4ab-480b2
解答○ ×x2-2xy-960y2
解答○ ×x2+xy-272y2
解答○ ×問題と解答
x2-2x-168(x+12)(x-14) a2+18a+72(a+6)(a+12) a2-21a+108(a-9)(a-12) x2+2x-288(x-16)(x+18) x2-4xy-192y2(x+12y)(x-16y) a2+4ab-480b2(a-20b)(a+24b) x2-2xy-960y2(x+30y)(x-32y) x2+xy-272y2(x-16y)(x+17y)
