FACTORIZING 8

Factorize completely at + ar - tr - t².  

solution

= at + ar - tr - t².  

= a(t + r) - t(r + t).

= (t + r)(a - t).

  Hence;  at + ar - tr - t²  =  (t + r)(a - t).

TRY THIS..................

Factorize completely cy + cr - yr - y².