Question

Factorise fully (n^2 - a^2) - (n - a)^2

Answer 1

u can write (n^2 - a^2) =(n-a)(n+a)
next take (n-a) as common n proceed

Answer 2

\[n^2 - a^2 - (n-a)^2 \implies n^2- a^2 - (n^2 -2an + a^2) \implies n^2 - a^2 - n^2 + 2an - a^2\]
does that help?

Answer 3

use formula (a2-b2)=(a+b)(a-b
)

Answer 4

sai1234 - thanks that was simple!
lgbasallote - sorry it was a bit confusing. thanks anyway!