Question

Simplify(6a –9b)2 +(6a+9b)^2

Answer 1

Answer:

$using \: identity \: {(x + y)}^{2} + {(x - y)}^{2} = 2( {x}^{2} + {y}^{2} ) \\ so \: {(6a - 9b)}^{2} + {(6a + 9b)}^{2} = 2( {(6a)}^{2} + {(9b)}^{2} ) \\ = 2(36 {a}^{2} + {81b}^{2} )$

Answer 2

Answer:

$= 2(36a {}^{2} + 81b {}^{2} )$