$$7x \times 8x$$
$56x^{2}$
$$7x^{2}\times 8$$
$$56x^{2}$$
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$112x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(7x^{2}\times 8)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(56x^{2})$$
$$2\times 56x^{2-1}$$
$$112x^{2-1}$$
$$112x^{1}$$
$$112x$$