Question

#1
27x³ - 343

#2

55²-45²
47²-44*47 +22²​

Answer 1

1. (3x-7)*(9x²+21x+49)

2.

1) (55-45)(55+45)=10*100=1000

2) (47-22)²=25²=625

3) 1000/625=1,6