# Algebra

posted by
**Ernie**
.

Find the 1st four hexagonal numbers and the formula

The difference of two squares a2 - b 2 can be found in

16sq2 – 13sq2 = 3(16 + 13) = 3 . 29 = 87

posted by
**Ernie**
.

Find the 1st four hexagonal numbers and the formula

The difference of two squares a2 - b 2 can be found in

16sq2 – 13sq2 = 3(16 + 13) = 3 . 29 = 87