1,21=(1+x/100)^2

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Solution for 1,21=(1+x/100)^2 equation: 


x in (-oo:+oo)

1.21 = (x/100+1)^2 // - (x/100+1)^2

1.21-(x/100+1)^2 = 0

1.21-1*(1/100*x+1)^2 = 0

1.21-1*(1/100*x+1)^2 = 0

0.21-1/10000*x^2-1/50*x = 0

0.21-1/10000*x^2-1/50*x = 0

0.21-1/10000*x^2-1/50*x = 0

DELTA = (-1/50)^2-(-1/10000*0.21*4)

DELTA = 0.000484

DELTA > 0

x = (0.000484^(1/2)+1/50)/(-1/10000*2) or x = (1/50-0.000484^(1/2))/(-1/10000*2)

x = -5000*(0.000484^(1/2)+1/50) or x = -5000*(1/50-0.000484^(1/2))

(x+5000*(0.000484^(1/2)+1/50))*(x+5000*(1/50-0.000484^(1/2))) = 0

(x+5000*(0.000484^(1/2)+1/50))*(x+5000*(1/50-0.000484^(1/2))) = 0

( x+5000*(0.000484^(1/2)+1/50) )

x+5000*(0.000484^(1/2)+1/50) = 0 // - 5000*(0.000484^(1/2)+1/50)

x = -(5000*(0.000484^(1/2)+1/50))

x = -5000*(0.000484^(1/2)+1/50)

( x+5000*(1/50-0.000484^(1/2)) )

x+5000*(1/50-0.000484^(1/2)) = 0 // - 5000*(1/50-0.000484^(1/2))

x = -(5000*(1/50-0.000484^(1/2)))

x = -5000*(1/50-0.000484^(1/2))

x in { -5000*(0.000484^(1/2)+1/50), -5000*(1/50-0.000484^(1/2)) }

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