(y - 8)(y - 2)
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If that's 15x2, the answer is (3x + 4)(5x - 4)
(y + 8)(y - 2)
In one bracket, write 16 times the square root of 2 minus 3x. In the other one, write 16 times the square root of 2 plus 3x.
Since 16 is a factor of 32, it is automatically the GCF.
The greatest factor of 21 and 16 is 21, which is a factor of 21 but not of 16.