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a=1, b=8, c=-5
X1,2=-b+-√b^2-4ac
2a
= -8+-√8^2-4(1)(-5)
2(1)
= -8+-√36+20
2
= -8+-√56
2
= -8+-√(4)(14)
2
= -8+-2√14
2
= -4+-√14
X1 = -4+√14
X2 = -4-√14
(X1-3X2)(X2-3X1)
[(-4+√14)-3(-4-√14)][(-4-√14)-3(-4+√14)]
[(-4+√14)+12+3√14)][(-4-√14)+12-3√14)]
[8+4√14][8-4√14]
64-16(14)
64-224=-160