Zonder de gemeenschappelijke tweeterm af en 'kuis op'.
- \((b-9)(b-6)-(3b-9)(b-9)\)
- \((p+7)(p-4)+(2p-8)(p+7)\)
- \((q+4)(q-9)+(4q+9)(q+4)\)
- \((9b+1)^2-(18b+2)\)
- \((2a+3)(a+5)-(2a+3)(3a-2)\)
- \((7y+9)(y+2)+(7y+9)(5y-4)\)
- \((3b-9)(b+3)+(3b-9)(2b+8)\)
- \((q-3)(q-2)+(4q+1)(q-3)\)
- \((8q+5)^2+(24q+15)\)
- \((5p+1)^2+(25p+5)\)
- \((3a+7)(a-1)+(3a+7)(4a-9)\)
- \((8b-9)(b+7)+(8b-9)(5b+8)\)
Zonder de gemeenschappelijke tweeterm af en 'kuis op'.
Verbetersleutel
- \((b-9)(b-6)-(3b-9)(b-9)\\=(b-9)(b-6-3b+9)\\=(b-9)(-2b+3)\)
- \((p+7)(p-4)+(2p-8)(p+7)\\=(p+7)(p-4+2p-8)\\=(p+7)(3p-12)\)
- \((q+4)(q-9)+(4q+9)(q+4)\\=(q+4)(q-9+4q+9)\\=(q+4)(5q+0)\)
- \((9b+1)^2-(18b+2)\\=(9b+1)(9b+1)-2(9b+1)\\=(9b-1)(9b+1)\)
- \((2a+3)(a+5)-(2a+3)(3a-2)\\=(2a+3)(a+5-3a+2)\\=(2a+3)(-2a+7)\)
- \((7y+9)(y+2)+(7y+9)(5y-4)\\=(7y+9)(y+2+5y-4)\\=(7y+9)(6y-2)\)
- \((3b-9)(b+3)+(3b-9)(2b+8)\\=(3b-9)(b+3+2b+8)\\=(3b-9)(3b+11)\)
- \((q-3)(q-2)+(4q+1)(q-3)\\=(q-3)(q-2+4q+1)\\=(q-3)(5q-1)\)
- \((8q+5)^2+(24q+15)\\=(8q+5)(8q+5)+3(8q+5)\\=(8q+8)(8q+5)\)
- \((5p+1)^2+(25p+5)\\=(5p+1)(5p+1)+5(5p+1)\\=(5p+6)(5p+1)\)
- \((3a+7)(a-1)+(3a+7)(4a-9)\\=(3a+7)(a-1+4a-9)\\=(3a+7)(5a-10)\)
- \((8b-9)(b+7)+(8b-9)(5b+8)\\=(8b-9)(b+7+5b+8)\\=(8b-9)(6b+15)\)