-x^2/16-21x/16-11/8

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Solution for -x^2/16-21x/16-11/8 equation: 


x in (-oo:+oo)

((-x)^2)/16-((21*x)/16)-(11/8) = 0

((-x)^2)/16+(-21/16)*x-11/8 = 0

1/16*x^2-21/16*x-11/8 = 0

DELTA = (-21/16)^2-(-11/8*1/16*4)

DELTA = 529/256

DELTA > 0

x = ((529/256)^(1/2)+21/16)/(1/16*2) or x = (21/16-(529/256)^(1/2))/(1/16*2)

x = 22 or x = -1

x in { -1, 22 }

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