-(x-5)
When you take the integers out right behind the "-" is a 1. so when you expand it will equal -x+5
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5 - x^2 = (the square root of 5 minus x)(the square root of 5 plus x)
(x + 4)(x + 1)
5x2 + 20 = 5*(x2 + 4) which cannot be factorised further.
6x³ +12x + 18 = 6(x + 1)(x² - x + 3)
It is 3(2y+5) when factorised