1/4b^2-7/20b-4/5

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Solution for 1/4b^2-7/20b-4/5 equation: 


b in (-oo:+oo)

(1/4)*b^2-((7/20)*b)-(4/5) = 0

(1/4)*b^2+(-7/20)*b-4/5 = 0

1/4*b^2-7/20*b-4/5 = 0

DELTA = (-7/20)^2-(-4/5*1/4*4)

DELTA = 369/400

DELTA > 0

b = ((369/400)^(1/2)+7/20)/(1/4*2) or b = (7/20-(369/400)^(1/2))/(1/4*2)

b = 2*((369/400)^(1/2)+7/20) or b = 2*(7/20-(369/400)^(1/2))

b in { 2*(7/20-(369/400)^(1/2)), 2*((369/400)^(1/2)+7/20) }

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