Factorise the following
z^2-5z+6
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Step-by-step explanation:
=-b±√b²-4ac/2a
=5±√25-4(1)(6)/2(1)
=5±√25-24/2
=5±√1/2
=5±1/2
=6/2 or 4/2
=3 or 2.
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