Obliczenia :
[tex](4\sqrt3-5)(4\sqrt3+5)=(4\sqrt3)^2-5^2=48-25=23\\\\(8-\sqrt7)^2=8^2-2\cdot8\cdot\sqrt7+(\sqrt7)^2=64-16\sqrt7+7=71-16\sqrt7\\\\(3x+4)^2=(3x)^2+2\cdot3x\cdot4+4^2=9x^2+24x+16[/tex]
Użyte wzory :
[tex](a+b)^2=a^2+2ab+b^2\\\\(a-b)^2=a^2-2ab+b^2\\\\(a+b)(a-b)=a^2-b^2[/tex]
