Binomials with a number added to a squared variable like (x^2+ 1) can be factored further using imaginary numbers. "i" stands for the square root of negative one. So (x^2+ 1) can be factored into (x + i) (x - i). This brings in the imaginary set of numbers. ...
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Write down the factors of 15. Because 15 has several factors, this method is called trial-and-error. When looking through the factors of 15, look for two that combine to equal the middle term. Three and five will equal two when subtracted. Because the middle term, 2x is positive, the ...
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