Question

calculeaza
(2+y)^2=
(2-z)^2=
(p-3)(p+3)=​

Answer 1

(2+y)²= 2²+2•2•y+y²= 4+4y+y²

(2-z)²=2²-2•2•z+z²=4-4z+z²

(p-3)(p+3)=p²-3²=p²-9