Question

(x
$(x + 3y) { }^{2} + (3x + y) {}^{2}$
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Answer 1

$\huge\tt\green{Solution}$

${(x + 3y)}^{2} + {(3x + y)}^{2} \\ \\ {x}^{2} + 6xy + 3 {y}^{2} + 9 {x}^{2} + 6xy + {y}^{2} \\ \\ 10 {x}^{2} + 12xy + 4 {y}^{2}$