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h in (-oo:+oo)
(1/2)*h*(h+4) = 48 // - 48
(1/2)*h*(h+4)-48 = 0
1/2*h*(h+4)-48 = 0
1/2*h*(h+4)-48 = 0
1/2*h^2+2*h-48 = 0
1/2*h^2+2*h-48 = 0
1/2*h^2+2*h-48 = 0
DELTA = 2^2-(-48*1/2*4)
DELTA = 100
DELTA > 0
h = (100^(1/2)-2)/(1/2*2) or h = (-100^(1/2)-2)/(1/2*2)
h = 8 or h = -12
(h+12)*(h-8) = 0
(h+12)*(h-8) = 0
( h+12 )
h+12 = 0 // - 12
h = -12
( h-8 )
h-8 = 0 // + 8
h = 8
h in { -12, 8 }
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