$$\frac{ { 4.5 }^{ 2 } - { 1.5 }^{ 2 } }{ 0.3 \times 0.5-0.3 }$$
$-120$
$$\frac{20.25-1.5^{2}}{0.3\times 0.5-0.3}$$
$$\frac{20.25-2.25}{0.3\times 0.5-0.3}$$
$$\frac{18}{0.3\times 0.5-0.3}$$
$$\frac{18}{0.15-0.3}$$
$$\frac{18}{-0.15}$$
$$\frac{1800}{-15}$$
$$-120$$
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