$${ \left(2a \right) }^{ 2 } -4 \times 1 \times -(4 { b }^{ 2 } - { a }^{ 2 } )$$
$16b^{2}$
$$2^{2}a^{2}-4\times 1\left(-\left(4b^{2}-a^{2}\right)\right)$$
$$4a^{2}-4\times 1\left(-\left(4b^{2}-a^{2}\right)\right)$$
$$4a^{2}-4\left(-\left(4b^{2}-a^{2}\right)\right)$$
$$4a^{2}-4\left(-4b^{2}+a^{2}\right)$$
$$4a^{2}+16b^{2}-4a^{2}$$
$$16b^{2}$$
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