$$16 ( a + b ) ^ { 2 } - 49 ( a - b ) ^ { 2 }$$
$\left(11a-3b\right)\left(11b-3a\right)$
$$16\left(a^{2}+2ab+b^{2}\right)-49\left(a-b\right)^{2}$$
$$16a^{2}+32ab+16b^{2}-49\left(a-b\right)^{2}$$
$$16a^{2}+32ab+16b^{2}-49\left(a^{2}-2ab+b^{2}\right)$$
$$16a^{2}+32ab+16b^{2}-49a^{2}+98ab-49b^{2}$$
$$-33a^{2}+32ab+16b^{2}+98ab-49b^{2}$$
$$-33a^{2}+130ab+16b^{2}-49b^{2}$$
$$-33a^{2}+130ab-33b^{2}$$
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$-33a^{2}+130ab-33b^{2}$
