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Anonymous
You could factor this as a difference of squares, but because 8 is not a perfect square, you would wind up with radicals in your answer:
x2 - 8
= (x + √8)(x - √8)
= (x + 2√2)(x - 2√2)
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(2x - 1)(5x + 8)
9 minus 8
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x-8
4*(x - 8)