$$\sqrt{-4}(2+5i)$$
$-10+4i$
$$2i\left(2+5i\right)$$
$$2i\times 2+2\times 5i^{2}$$
$$2i\times 2+2\times 5\left(-1\right)$$
$$-10+4i$$
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$-10$
$$Re(2i\left(2+5i\right))$$
$$Re(2i\times 2+2\times 5i^{2})$$
$$Re(2i\times 2+2\times 5\left(-1\right))$$
$$Re(-10+4i)$$
$$-10$$
