$$( a - b ) ^ { 2 } + ( 2 a + 2 b ) ^ { 2 }$$
$4\left(a+b\right)^{2}+\left(a-b\right)^{2}$
$$a^{2}-2ab+b^{2}+\left(2a+2b\right)^{2}$$
$$a^{2}-2ab+b^{2}+4a^{2}+8ab+4b^{2}$$
$$5a^{2}-2ab+b^{2}+8ab+4b^{2}$$
$$5a^{2}+6ab+b^{2}+4b^{2}$$
$$5a^{2}+6ab+5b^{2}$$
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$5a^{2}+6ab+5b^{2}$
