Скачать или смотреть In certain circumstances, the sum of two perfect squares can be factored by adding and subtracting …

In certain circumstances, the sum of two perfect squares can be factored by adding and subtracting the same perfect square. For example, x^4+4=x^4+4 x^2+4-4 x^2 . Add and subtract 4 x^2. Use this first step to factor x^4+4

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