$${ \left(8x \right) }^{ 2 } +6 \times -1+ { \left(7x \right) }^{ 2 } -9x-2$$
$113x^{2}-9x-8$
$$8^{2}x^{2}+6\left(-1\right)+\left(7x\right)^{2}-9x-2$$
$$64x^{2}+6\left(-1\right)+\left(7x\right)^{2}-9x-2$$
$$64x^{2}-6+\left(7x\right)^{2}-9x-2$$
$$64x^{2}-6+7^{2}x^{2}-9x-2$$
$$64x^{2}-6+49x^{2}-9x-2$$
$$113x^{2}-6-9x-2$$
$$113x^{2}-8-9x$$
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