How to factorise it (a–2b)²–5(a–2b)+6
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Let a-2b=x
X²-5x+6=0
X²-3x-2x+6=0
X(x-3)-2(x-3)=0
X=2 x=3
X²-5x+6=0
X²-3x-2x+6=0
X(x-3)-2(x-3)=0
X=2 x=3
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