(20-18x^2)/((9x^2+10)^2)

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Solution for (20-18x^2)/((9x^2+10)^2) equation: 


D( x )

(9*x^2+10)^2 = 0

(9*x^2+10)^2 = 0

(9*x^2+10)^2 = 0

9*x^2 = -10 // : 9

x^2 = -10/9

x in (-oo:+oo)

(20-(18*x^2))/((9*x^2+10)^2) = 0

(20-18*x^2)/((9*x^2+10)^2) = 0

-18*x^2 = -20 // : -18

x^2 = 10/9

x^2 = 10/9 // ^ 1/2

abs(x) = (10/9)^(1/2)

x = (10/9)^(1/2) or x = -(10/9)^(1/2)

x in { (10/9)^(1/2), -(10/9)^(1/2) }

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