a2+b2+8a+6b+25=0,a3+b3=???
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the answers of this question is ab4
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Break 25 into 16 and 9
(a²+8a+16)+(b²+6b+9) = 0
(a+4)²+(b+3)²= 0
(a+4)=(b+3)=0
a=-4 , b = -3
a³+b³ = -91
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