a²-4a-1=0 solve by using formula
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a2 -4a =1 dividing by a
a-4=1/a
a-1/a=4
on squaring both sides
a2-2+1/a2=16
a2+1/a2=16+2=18
a-4=1/a
a-1/a=4
on squaring both sides
a2-2+1/a2=16
a2+1/a2=16+2=18
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