Question

 contesta estos productos notables
[x^{2} -1)( x^{2} -7 
(a2+x)(a+x)
(x+1)(x-1)
(a2+8)(a2-7)
(ab+3)(3-ab)

Answer 1

[x^{2} -1)( x^{2} -7 x^4-7x^2-x^2+7
x^4-8x^2+7

(a2+x)(a+x)
(2a+x)(a+x)
2a^2+2ax+ax+x^2
2a^2+3ax+x^2

(x+1)(x-1)
x^2-1^2
x^2-1

(a2+8)(a2-7)
(2a+8)(2a-7)
4a^2-14a+16a-56
4a^2+2a-56

(ab+3)(3-ab)
(3+ab)(3-ab)
9-a^2b^2