Quote:
Originally Posted by masraum
mental trial and error
the leading interger 2 must be factored (2 and 1, 2*1 = 2). The -15 must be factored, (options are -1,15, 1,-15, -3,5 or 3,-5)
You then have to multiply and then add to get the middle interger (+7)
so
(2*-3) + (1*5) = -1
(2*3) + (1*-5) = 1
(2*-5) + (1*3) = -7 (close, but not quite)
(2*5) + (1*-3) = 10 + -3 = 7 --> (+7x)
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Excellent info! If I get one of these on test day I'll nail it. Test is on October 27th.