Question

[ax+by] ^2 + {ay-bx] ^ 2

Answer 1

Step-by-step explanation:

${(ax + by)}^{2} + {(ax - by)}^{2}$

$( {a}^{2} {x}^{2} + 2abxy + {a}^{2} {y}^{2} ) + ( {a}^{2} {x}^{2} - 2abxy + {a}^{2} {y}^{2} )$

$2( {a}^{2} {x}^{2} + {b}^{2} {y}^{2})$