(a-7)^2 (8a-7)2 (4x+y)^2 (a^2-7)^2

Question

(a-7)^2
(8a-7)2
(4x+y)^2
(a^2-7)^2

Answer 1

1)а^2-14а+49
2)64а^2-112+49
3)16х^2+8ху+у^2
4)а^4-14а^2+49