Question

Разложите на множители:
1) (3b-5)²-49;
2)a⁴-(a-7)²

Answer 1

1)(3b-5)²-49=9b²-30b+25-49=9b²-30b-24
или 
(3b-5)²-49=9b²-30b+25-49=9b²-30b-24=3(3b²-10b-8).
2)a⁴-(a-7)²=a⁴-a²+14a-49.