(x + 4)(3x + 35)
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15x + 32x - 28 = 47x - 28 = (√47x)2 - (√28)2 = (√47x)2 - (2√7)2 = (√47x - 2√7)(√47x + 2√7)
anything in the 47x table (i.e. 47, 94, 141 etc)....or maybe you meant what can 47 be divided by.In that case the answer would be just 47 and 1. Hence 47 is a prime number.[If you didn't mean that then please ignore that last bit] ;-)