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D( x )
4*x^2+16*x-128 = 0
4*x^2+16*x-128 = 0
4*x^2+16*x-128 = 0
4*x^2+16*x-128 = 0
DELTA = 16^2-(-128*4*4)
DELTA = 2304
DELTA > 0
x = (2304^(1/2)-16)/(2*4) or x = (-2304^(1/2)-16)/(2*4)
x = 4 or x = -8
x in (-oo:-8) U (-8:4) U (4:+oo)
(X^2-(7*x)+12)/(4*x^2+16*x-128) = 0
(X^2-7*x+12)/(4*x^2+16*x-128) = 0
4*x^2+16*x-128 = 0
4*(x^2+4*x-32) = 0
x^2+4*x-32 = 0
DELTA = 4^2-(-32*1*4)
DELTA = 144
DELTA > 0
x = (144^(1/2)-4)/(1*2) or x = (-144^(1/2)-4)/(1*2)
x = 4 or x = -8
4*(x+8)*(x-4) = 0
(X^2-7*x+12)/(4*(x+8)*(x-4)) = 0
X^2-7*x+12 = 0 // - X^2+12
-7*x = -(X^2+12) // : -7
x = (-(X^2+12))/(-7)
x = (X^2+12)/7
x = (X^2+12)/7
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