Question

long fom with examples

Answer 1

${(a + b)}^{2} = {a}^{2} + {b}^{2} + 2ab \\ let \: a = 1 \: and \: b = 2 \\ then \: we \: have \: in \: lhs = {(1 + 2)}^{2} \\ and \: in \: rhs \: is \: = {1}^{2} + {2}^{2} + 2 \times 1 \times 2 \\ that \: is \: in \: rhs \: = {3}^{2} and \: in \: lhs \: = \\ 1 + 4 + 4 = 9 \\ here {3}^{2} = 9....proved$