8x-9/4x^2+8x+7x=-4

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Solution for 8x-9/4x^2+8x+7x=-4 equation: 


x in (-oo:+oo)

8*x-((9/4)*x^2)+8*x+7*x = -4 // + 4

8*x-((9/4)*x^2)+8*x+7*x+4 = 0

(-9/4)*x^2+8*x+8*x+7*x+4 = 0

23*x-9/4*x^2+4 = 0

DELTA = 23^2-(-9/4*4*4)

DELTA = 565

DELTA > 0

x = (565^(1/2)-23)/(-9/4*2) or x = (-565^(1/2)-23)/(-9/4*2)

x = -2/9*(565^(1/2)-23) or x = 2/9*(565^(1/2)+23)

x in { -2/9*(565^(1/2)-23), 2/9*(565^(1/2)+23) }

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