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a^4 - b^4 - 4*a^2*x %2B 4*x^2=0 |
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Answer» 4x^2-4a^2x+( a^4-b^4)=0; 4x^2-{2(a^2+b^2)+2(a^2-b^2)}x+(a^2-b^2)(a^2+b^2)=0, {2x-(a^2-b^2)}{2x-(a^2+ b^2)}=0; 2x=a^2-b^2 or 2x=a^2+b^2; x=a^2-b^2/2/// a^2+ b^2 |
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