Question

A) (x-2y)(2y+X)
b) (2xy-5)(5+2xy)
c) (x-√2)(x+√2)
d) (x-2/3)(2/3+x)

Answer 1

A)  (x-2y)(2y+X) = x^2-4y^2
b) (2xy-5)(5+2xy) = 4x^2y^2-25
c)  (x-√2)(x+√2) = x^2-2
d) (x-2/3)(2/3+x) = x^2-4/9
 chyba tak ;)