解
展開する (x−2)5(x+2)6x4
解
x15−10x13+40x11−80x9+80x7−32x5+2x14−102x12+402x10−802x8+802x6−322x4
解答ステップ
(x−2)5(x+2)6x4
=x4(x−2)5(x+2)6
拡張 (x−2)5:x5−52x4+20x3−202x2+20x−42
=x4(x5−52x4+20x3−202x2+20x−42)(x+2)6
=x4(x+2)6(x5−52x4+20x3−202x2+20x−42)
括弧を分配する=x4(x+2)6x5+x4(x+2)6(−52x4)+x4(x+2)6⋅20x3+x4(x+2)6(−202x2)+x4(x+2)6⋅20x+x4(x+2)6(−42)
簡素化 x4(x+2)6x5+x4(x+2)6(−52x4)+x4(x+2)6⋅20x3+x4(x+2)6(−202x2)+x4(x+2)6⋅20x+x4(x+2)6(−42):x9(x+2)6−52x8(x+2)6+20x7(x+2)6−202x6(x+2)6+20x5(x+2)6−42x4(x+2)6
=x9(x+2)6−52x8(x+2)6+20x7(x+2)6−202x6(x+2)6+20x5(x+2)6−42x4(x+2)6
拡張 x9(x+2)6:x15+62x14+30x13+402x12+60x11+242x10+8x9
=x15+62x14+30x13+402x12+60x11+242x10+8x9−52x8(x+2)6+20x7(x+2)6−202x6(x+2)6+20x5(x+2)6−42x4(x+2)6
拡張 −52x8(x+2)6:−52x14−60x13−1502x12−400x11−3002x10−240x9−402x8
=x15+62x14+30x13+402x12+60x11+242x10+8x9−52x14−60x13−1502x12−400x11−3002x10−240x9−402x8+20x7(x+2)6−202x6(x+2)6+20x5(x+2)6−42x4(x+2)6
拡張 20x7(x+2)6:20x13+1202x12+600x11+8002x10+1200x9+4802x8+160x7
=x15+62x14+30x13+402x12+60x11+242x10+8x9−52x14−60x13−1502x12−400x11−3002x10−240x9−402x8+20x13+1202x12+600x11+8002x10+1200x9+4802x8+160x7−202x6(x+2)6+20x5(x+2)6−42x4(x+2)6
拡張 −202x6(x+2)6:−202x12−240x11−6002x10−1600x9−12002x8−960x7−1602x6
=x15+62x14+30x13+402x12+60x11+242x10+8x9−52x14−60x13−1502x12−400x11−3002x10−240x9−402x8+20x13+1202x12+600x11+8002x10+1200x9+4802x8+160x7−202x12−240x11−6002x10−1600x9−12002x8−960x7−1602x6+20x5(x+2)6−42x4(x+2)6
拡張 20x5(x+2)6:20x11+1202x10+600x9+8002x8+1200x7+4802x6+160x5
=x15+62x14+30x13+402x12+60x11+242x10+8x9−52x14−60x13−1502x12−400x11−3002x10−240x9−402x8+20x13+1202x12+600x11+8002x10+1200x9+4802x8+160x7−202x12−240x11−6002x10−1600x9−12002x8−960x7−1602x6+20x11+1202x10+600x9+8002x8+1200x7+4802x6+160x5−42x4(x+2)6
拡張 −42x4(x+2)6:−42x10−48x9−1202x8−320x7−2402x6−192x5−322x4
=x15+62x14+30x13+402x12+60x11+242x10+8x9−52x14−60x13−1502x12−400x11−3002x10−240x9−402x8+20x13+1202x12+600x11+8002x10+1200x9+4802x8+160x7−202x12−240x11−6002x10−1600x9−12002x8−960x7−1602x6+20x11+1202x10+600x9+8002x8+1200x7+4802x6+160x5−42x10−48x9−1202x8−320x7−2402x6−192x5−322x4
簡素化 x15+62x14+30x13+402x12+60x11+242x10+8x9−52x14−60x13−1502x12−400x11−3002x10−240x9−402x8+20x13+1202x12+600x11+8002x10+1200x9+4802x8+160x7−202x12−240x11−6002x10−1600x9−12002x8−960x7−1602x6+20x11+1202x10+600x9+8002x8+1200x7+4802x6+160x5−42x10−48x9−1202x8−320x7−2402x6−192x5−322x4:x15−10x13+40x11−80x9+80x7−32x5+2x14−102x12+402x10−802x8+802x6−322x4
=x15−10x13+40x11−80x9+80x7−32x5+2x14−102x12+402x10−802x8+802x6−322x4