x2-18x+81/4x-36/10x-90/40

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Solution for x2-18x+81/4x-36/10x-90/40 equation: 


x in (-oo:+oo)

x^2-(18*x)+(81/4)*x-((36/10)*x)-(90/40) = 0

x^2-18*x+(81/4)*x+(-18/5)*x-9/4 = 0

x^2-27/20*x-9/4 = 0

DELTA = (-27/20)^2-(-9/4*1*4)

DELTA = 4329/400

DELTA > 0

x = ((4329/400)^(1/2)+27/20)/(1*2) or x = (27/20-(4329/400)^(1/2))/(1*2)

x = ((4329/400)^(1/2)+27/20)/2 or x = (27/20-(4329/400)^(1/2))/2

x in { (27/20-(4329/400)^(1/2))/2, ((4329/400)^(1/2)+27/20)/2 }

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