solve the quadratic equation 4x 2 +4bx-(a 2 -b 2 )=0
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4x^2+4bx-(a^2-b^2)=0
4x^2+4bx+b^2-a^2=0
(2x+b)^2-a^2=0
(2x+b-a)(2x+b+a)=0
x=(a-b)/2,-(a+b)/2
4x^2+4bx+b^2-a^2=0
(2x+b)^2-a^2=0
(2x+b-a)(2x+b+a)=0
x=(a-b)/2,-(a+b)/2
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