2x/7x-9-3/7x

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Solution for 2x/7x-9-3/7x equation: 


x in (-oo:+oo)

((2*x)/7)*x-((3/7)*x)-9 = 0

((2*x)/7)*x+(-3/7)*x-9 = 0

2/7*x^2-3/7*x-9 = 0

DELTA = (-3/7)^2-(-9*2/7*4)

DELTA = 513/49

DELTA > 0

x = ((513/49)^(1/2)+3/7)/(2/7*2) or x = (3/7-(513/49)^(1/2))/(2/7*2)

x = 7/4*((513/49)^(1/2)+3/7) or x = 7/4*(3/7-(513/49)^(1/2))

x in { 7/4*(3/7-(513/49)^(1/2)), 7/4*((513/49)^(1/2)+3/7) }

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