=((x+5)+(x-5))((x+5)²-(x+5)(x-5)+(x-5)²)=x²(x²+10x+25-(x²-25)+x²-10x+25)=x²(2x²+50-x²+25)=x²(x²+75)=x⁴+75x²
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=((x+5)+(x-5))((x+5)²-(x+5)(x-5)+(x-5)²)=x²(x²+10x+25-(x²-25)+x²-10x+25)=x²(2x²+50-x²+25)=x²(x²+75)=x⁴+75x²