Question

whats the answer to this question ​

Answer 1

$heya \\ \\ \\ ( \alpha {}^{2} + \beta {}^{2} ) = ( \alpha + \beta ) {}^{2} - 2 \alpha \beta \\ \\ \\ \\ \\ r.h.s \\ \\ \\ \\ ( \alpha + \beta ) {}^{2} - 2 \alpha \beta \\ \\ \\ \\ \alpha { }^{2} + \beta {}^{2} + 2 \alpha \beta - 2 \alpha \beta \\ \\ \\ \\ \alpha {}^{2} + \beta {}^{2} \\ \\ \\ \\ so \: \: \: \: ( \alpha {}^{2} + \beta {}^{2} ) \: \: can \: \: be \: \: \: written \: \: \: \: as \: \: \: \\ \\ \\ (\alpha + \beta ) {}^{2} - 2 \alpha \beta$