Find a natural number whose square diminished by 1 is equal to 4 times of 5 more than the given number.
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let No. x
x^2-1=4x-5
x^2-4x-1+5=0
x^2-4x+4=0
(x-2)^2=0
x-2=0
x=2
x^2-1=4x-5
x^2-4x-1+5=0
x^2-4x+4=0
(x-2)^2=0
x-2=0
x=2
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