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-(x - 1)(x2 + x + 1)
The discriminant for the quadratic is b2-4ac = 302 - 4*4*45 = 900 - 720 = 180 Since 180 is not a perfect square, the roots of the equation are irrational and it is far from straightforward to solve such an equation by factoring.
15% of 80 = 80*15/100 = 12
It is: 80/250 times 100 = 32%
factoring 80=2*2*2*2*5 115=5*23 LCM=2*2*2*5*23=1,840