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2014-08-15T21:57:33-03:00
Δ=(-4)²-4(1)(-60)
Δ=16+240
Δ=256

x=-(-4) +/- 16÷2(1)
x'=4+16÷2
x'=10

x''4-16÷2
x''=-6
1 5 1
2014-08-15T22:37:35-03:00
X²-4x-60=0

∆=(-4)²-4.1.(-60)
∆=16+240
∆=256

x'=[-(-4)+√256]/2.1=[4+16]/2=20/2=10
x''=[-(-4)-√256]/2.1=[4-16]/2=-12/2=-6

S={-6,10}