X square + 4 x minus 60 equal to zero
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x²+4x-60=0
x=-4±√[16-4×1×(-60)]/2
=4±√256/2
=(4±16)/2
x=(10,-6)
x=-4±√[16-4×1×(-60)]/2
=4±√256/2
=(4±16)/2
x=(10,-6)
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