Question

plz don't give silly answers ​

Answer 1

$\huge \purple{answer}$

$\bf \green {by \: simplification}$

$\bf \red{(9p - 5q) {}^{2} + 108pq = ( 9p + 5q) {}^{2} } \\ \bf \green{as \: we \:know \:( a + b {)}^{2} = a {}^{2} { + b {}^{2} }^{} + 2ab} \\ \: \bf \green{and \: (a - b) { }^{2} = a {}^{2} + b {}^{2} - 2ab}$

$\bf \red{9p {}^{2} + 5q {}^{2} - 2(5q)(9p) + 180pq = 9p {}^{2} + 5q{}^{2} + 2(5q)(9p)}$

$\bf \red{81p {}^{2} + 25q {}^{2} - 90pq + 108pq = 81p {}^{2} + 25q {}^{2} + 90pq}$

$\\ \bf \green{moving \: {81p {}^{2} + 25q {}^{2} - 90pq + 108pq = 81p {}^{2} + 25q {}^{2} + 90pq} \: to \:lhs \: from \: rhs } \\ \\ \bf \red{81p {}^{2} + 25q {}^{2} - 90pq + 108pq - 81p {}^{2} - 25q {}^{2} - 90pq = 0} \\ \\ \bf \red{108pq}$