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Sagot :
Answer:
if you mean expansion, we have;
-4d(-4d-1)-6(-4d-1)=0
16d^2+4d+24d+6=0
16d^2+28d+6=0
To find d,we have
-4d-6=0. or -4d-1= 0
-4d=6. or -4d=1
d= -6/4. or d =-1/4
d= -3/2 or -1/4
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