Zonder de gemeenschappelijke tweeterm af en 'kuis op'.
- \((q-1)(q+9)+(3q-5)(q-1)\)
- \((3b-8)(b+2)-(3b-8)(2b-2)\)
- \((s-7)(s-1)+(3s+5)(s-7)\)
- \((2x+1)^2-(10x+5)\)
- \((5b-9)(b-6)+(5b-9)(4b-4)\)
- \((2a+2)(a+2)-(2a+2)(5a-1)\)
- \((a+5)(a-4)+(4a-7)(a+5)\)
- \((7x+8)^2+(28x+32)\)
- \((9x+4)^2+(27x+12)\)
- \((7b+5)^2-(14b+10)\)
- \((x+2)(x+9)-(3x-2)(x+2)\)
- \((5s-8)(s+5)+(5s-8)(3s+3)\)
Zonder de gemeenschappelijke tweeterm af en 'kuis op'.
Verbetersleutel
- \((q-1)(q+9)+(3q-5)(q-1)\\=(q-1)(q+9+3q-5)\\=(q-1)(4q+4)\)
- \((3b-8)(b+2)-(3b-8)(2b-2)\\=(3b-8)(b+2-2b+2)\\=(3b-8)(-b+4)\)
- \((s-7)(s-1)+(3s+5)(s-7)\\=(s-7)(s-1+3s+5)\\=(s-7)(4s+4)\)
- \((2x+1)^2-(10x+5)\\=(2x+1)(2x+1)-5(2x+1)\\=(2x-4)(2x+1)\)
- \((5b-9)(b-6)+(5b-9)(4b-4)\\=(5b-9)(b-6+4b-4)\\=(5b-9)(5b-10)\)
- \((2a+2)(a+2)-(2a+2)(5a-1)\\=(2a+2)(a+2-5a+1)\\=(2a+2)(-4a+3)\)
- \((a+5)(a-4)+(4a-7)(a+5)\\=(a+5)(a-4+4a-7)\\=(a+5)(5a-11)\)
- \((7x+8)^2+(28x+32)\\=(7x+8)(7x+8)+4(7x+8)\\=(7x+12)(7x+8)\)
- \((9x+4)^2+(27x+12)\\=(9x+4)(9x+4)+3(9x+4)\\=(9x+7)(9x+4)\)
- \((7b+5)^2-(14b+10)\\=(7b+5)(7b+5)-2(7b+5)\\=(7b+3)(7b+5)\)
- \((x+2)(x+9)-(3x-2)(x+2)\\=(x+2)(x+9-3x+2)\\=(x+2)(-2x+11)\)
- \((5s-8)(s+5)+(5s-8)(3s+3)\\=(5s-8)(s+5+3s+3)\\=(5s-8)(4s+8)\)