Rumus kali akar-akar persamaan kuadrat
a)x1 + x2 = - b
a
b) x1 . x2 = c
a
c)x12 + x22 =(x1+x2)2 – 2x1x2
d) x1 – x2 = ÖD
a
e)x12 – x22 = (x1-x2 ) (x1+x2)
f) x13 + x23 = (x1+x2)3 – 3x1x2 (x1+x2)
g)x13 – x23 = (x1-x2)3 + 3 x1 x2 (x1-x2)
h) 1 + 1 = x1+ x2
x1 x2 x1x2
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