1) (4a-b^2)^2 =16а^2-8аb^2+b^4
2) (x^4 - 9x )^2 =x^8-18x^5+81x^2
3) (a-4) (a+4) =a^-16
4) (4 - x^2) (4 +x^2)=16-x^4
1) (4a-b^2)^2 =16а^2-8аb^2+b^4
2) (x^4 - 9x )^2 =x^8-18x^5+81x^2
3) (a-4) (a+4) =a^-16
4) (4 - x^2) (4 +x^2)=16-x^4