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a in (-oo:+oo)
5/4 = a*((a+4)/2) // - a*((a+4)/2)
5/4-(a*((a+4)/2)) = 0
(-1*a*(a+4))/2+5/4 = 0
(-1*4*a*(a+4))/(2*4)+(2*5)/(2*4) = 0
2*5-1*4*a*(a+4) = 0
10-4*a^2-16*a = 0
10-4*a^2-16*a = 0
2*(5-2*a^2-8*a) = 0
5-2*a^2-8*a = 0
DELTA = (-8)^2-(-2*4*5)
DELTA = 104
DELTA > 0
a = (104^(1/2)+8)/(-2*2) or a = (8-104^(1/2))/(-2*2)
a = (2*26^(1/2)+8)/(-4) or a = (8-2*26^(1/2))/(-4)
2*(a-((2*26^(1/2)+8)/(-4)))*(a-((8-2*26^(1/2))/(-4))) = 0
(2*(a-((2*26^(1/2)+8)/(-4)))*(a-((8-2*26^(1/2))/(-4))))/(2*4) = 0
(2*(a-((2*26^(1/2)+8)/(-4)))*(a-((8-2*26^(1/2))/(-4))))/(2*4) = 0 // * 2*4
2*(a-((2*26^(1/2)+8)/(-4)))*(a-((8-2*26^(1/2))/(-4))) = 0
( a-((2*26^(1/2)+8)/(-4)) )
a-((2*26^(1/2)+8)/(-4)) = 0 // + (2*26^(1/2)+8)/(-4)
a = (2*26^(1/2)+8)/(-4)
( a-((8-2*26^(1/2))/(-4)) )
a-((8-2*26^(1/2))/(-4)) = 0 // + (8-2*26^(1/2))/(-4)
a = (8-2*26^(1/2))/(-4)
a in { (2*26^(1/2)+8)/(-4), (8-2*26^(1/2))/(-4) }
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