factorise after taking out HCF. a4-4a3+4a2
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Step-by-step explanation:
a2(a2-4a+4)
a2(a2-2a-2a+4)
a2(a(a-2)-2(a-2))
a2((a-2)(a-2))=0
a2=0,a-2=0,a-2=0
a=0,a=2,a=2
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