Answer:
What is this question about for math I don't have idea
=n²+2nr−2nt+r²−2rt+t²
Step-by-step explanation:
(r−t+n)²
=(r−t+n)(r−t+n)
=(r)(r)+(r)(−t)+(r)(n)+(−t)(r)+(−t)(−t)+(−t)(n)+(n)(r)+(n)(−t)+(n)(n)
=r²−rt+nr−rt+t²−nt+nr−nt+n²
