9x2 - 6b2 x - ( a4 -b4) =0
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Step-by-step explanation:
9x2-6b2x+b4-a4=0
(3x)2-2.3.b2+(b2)2-a4=0
(3x-b2)2-(a2)2=0
(3x-b2+a2)(3x-b2-a2)=0
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