$$(9x)(2x)-(7x)(2x)+(3x)(2x)-(2x)(1x)$$
$8x^{2}$
$$9x^{2}\times 2-7x\times 2x+3x\times 2x-2x\times 1x$$
$$9x^{2}\times 2-7x^{2}\times 2+3x\times 2x-2x\times 1x$$
$$9x^{2}\times 2-7x^{2}\times 2+3x^{2}\times 2-2x\times 1x$$
$$9x^{2}\times 2-7x^{2}\times 2+3x^{2}\times 2-2x^{2}\times 1$$
$$18x^{2}-7x^{2}\times 2+3x^{2}\times 2-2x^{2}\times 1$$
$$18x^{2}-14x^{2}+3x^{2}\times 2-2x^{2}\times 1$$
$$4x^{2}+3x^{2}\times 2-2x^{2}\times 1$$
$$4x^{2}+6x^{2}-2x^{2}\times 1$$
$$10x^{2}-2x^{2}\times 1$$
$$10x^{2}-2x^{2}$$
$$8x^{2}$$
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$16x$
$$\frac{\mathrm{d}}{\mathrm{d}x}(9x^{2}\times 2-7x\times 2x+3x\times 2x-2x\times 1x)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(9x^{2}\times 2-7x^{2}\times 2+3x\times 2x-2x\times 1x)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(9x^{2}\times 2-7x^{2}\times 2+3x^{2}\times 2-2x\times 1x)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(9x^{2}\times 2-7x^{2}\times 2+3x^{2}\times 2-2x^{2}\times 1)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(18x^{2}-7x^{2}\times 2+3x^{2}\times 2-2x^{2}\times 1)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(18x^{2}-14x^{2}+3x^{2}\times 2-2x^{2}\times 1)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(4x^{2}+3x^{2}\times 2-2x^{2}\times 1)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(4x^{2}+6x^{2}-2x^{2}\times 1)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(10x^{2}-2x^{2}\times 1)$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(10x^{2}-2x^{2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(8x^{2})$$
$$2\times 8x^{2-1}$$
$$16x^{2-1}$$
$$16x^{1}$$
$$16x$$
