A positive no. when decreased by 4 is equal to 21 times reciprocal of the no. what is the no.
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A-4=21 × 1/A,
A-4=21/A,
A²-4A=21,
A²-4A-21=0,
(A-7)(A+3)=0,
if
A-7=0,
A=7,
if
A+3=0,
A=-3
A-4=21/A,
A²-4A=21,
A²-4A-21=0,
(A-7)(A+3)=0,
if
A-7=0,
A=7,
if
A+3=0,
A=-3
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