8x to the second power is 64x2
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64x2-80x+25 = (8x-5)(8x-5) when factored
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8x
-8x - 10 - 20 = -8x - 30
2a to the second power. If you combine the like terms, (a to the second power + a to the second power), it would be the same as 2a to the second power.