5/7x^2-20/7x-15=0

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Solution for 5/7x^2-20/7x-15=0 equation: 


x in (-oo:+oo)

(5/7)*x^2-((20/7)*x)-15 = 0

(5/7)*x^2+(-20/7)*x-15 = 0

5/7*x^2-20/7*x-15 = 0

DELTA = (-20/7)^2-(-15*5/7*4)

DELTA = 2500/49

DELTA > 0

x = ((2500/49)^(1/2)+20/7)/(5/7*2) or x = (20/7-(2500/49)^(1/2))/(5/7*2)

x = 7 or x = -3

x in { -3, 7 }

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