przykłady prosze zrobic według tego : (a-b)(a+b)= a-b
(\frac{1}{7}x-5)(\frac{1}{7}x+5)=
(\sqrt{7}+3y)(\sqrt{7}-3y)=
(-4+x)(x+4)=
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(1/7x-5)(1/7x+5)=1/49x²-25,
(√7+3y)(√7-3y)=7-9y²
(-4+x)(x+4)=(x-4)(x+4)=x²-16