Умоляю помогите!!!!!!Дам много баллов!!!!!

Question

Умоляю помогите!!!!!!
Дам много баллов!!!!!

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Comments

1)(a-9)(a+9)=a^2-81

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2)(x^2-4)(x^2+4)=x^4-16

Answer 1

3)(c-1/7)(1/7+c)=1/7c+c^2-1/49-1/7c=c^2-1/49
4)(3a-b^4)(b^4+3a)=3ab^4+9a^2-b^8-3ab^4=9a^2-b^8
5)(q^11+1/8)(1/8-q^11)=1/8q^11-q^22+1/64-1/8q^11=-q^22+1/64
6)(0.2+x)(x-0.2)=0.2x-0.04+x^2-0.2x=-0.04+x^2
7)(y+5/12)(5/12-y)=5/12y-y^2+25/144-5/12y=-y^2+25/144
8)(a^3b^5-2)(2+a^3b^5)=2a^3b^5+a^6b^10-4-2a^3b^5=a^6b^10-4