Question

Prove that alpha square plus beta square equal to bracket alpha + beta square minus 2 alpha beta

Answer 1

Answer:

1. alpha square+beta square=(alpha+beta) square-2(alpha)(beta)
2. alpha square+beta square=alpha square+beta square+2(alpha)(beta)-2(alpha)(beta)
3. +2(alpha)(beta) & -2(alpha)(beta) are cancelle
4. therefore,alpha square+beta square=alpha square+beta square