a²+b²+c²-x²+2ab+2bc+2ac=(a²+b²+c²+2ab+2ac+2bc)-x²=(a+b+c)²-x²=(a+b+c-x)(a+b+c+x)
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a²+b²+c²-x²+2ab+2bc+2ac=(a²+b²+c²+2ab+2ac+2bc)-x²=(a+b+c)²-x²=(a+b+c-x)(a+b+c+x)