>(-8x - (-3))^2 = (-8x)^2 - 2 x(-8x)x(-3) + (-3)^2
=16x^2 - 48x + 9
>(-8x + 3)^2 = (-8x)^2 + 2 x (-8x)x 3 + 3^2
=16x^2 + -48x + 9
>(7x - 9)^2 = (7x)^2 - 2 x (7x) x 9 + 9^2
=49x^2 - 126x + 49
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>(-8x - (-3))^2 = (-8x)^2 - 2 x(-8x)x(-3) + (-3)^2
=16x^2 - 48x + 9
>(-8x + 3)^2 = (-8x)^2 + 2 x (-8x)x 3 + 3^2
=16x^2 + -48x + 9
>(7x - 9)^2 = (7x)^2 - 2 x (7x) x 9 + 9^2
=49x^2 - 126x + 49