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2015-10-17T18:23:01+08:00

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The two facing pages are consecutive pages.

Let the first page of the two be x
Let the next page be x + 1

The product of the two facing pages is 306:

(x) (x + 1) = 306
x² + x = 306

Write as quadratic equation ax² + bx + c =0:

x² + x - 306 = 0

Solve by quadratic formula or factoring.
By factoring:

(x - 17) (x + 18) = 0

x - 17 - 0                x + 18 = 0
x = 17                    x = -18

Choose the positive root (solution), x = 17

The pages are 17 and 18.
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