Question

Ребята помогите пожалуйста ​

Answer 1

$1. (x-y)(x+y) = x^2-y^2\\\\2. (1+a)(1-a) = 1-a^2\\\\3.(3z-2k)(2k+3z) = 9z^2 - 4k^2\\\\4.(5+a)(5-a)=25-a^2\\\\5.(4-7x)(7x+4) = 16 - 49x^2$

$6.(a^2+6)(a^2-6) = a^4 - 36\\\\7. (-x+1)(1+x) = 1 - x^2\\\\8.(8a^2+y)(y-8a^2) = y^2 - 64a^4\\\\9.(0,6+b^4)(0,6-b^4)=0,36 - b^8\\\\10.(-a-b)(a-b) = -a^2 + ab - ab+b^2 = b^2 - a^2$

$11. (0,5x+7)(7-0,5x) = 49 - 0,25x^2\\\\ 12. (z-10)(z+10) = z^2-100\\\\ 13. (-x^3-1)(1-x^3) = -x^3+x^6 - 1 + x^3 = x^6 - 1\\\\14. (a+9b^2)(9b^2-a) = 81b^4 - a^2\\\\ 15. (6n^2+1)(6n^2-1) = 36n^4 - 1$