What is the HCF of \[{{\mathbf{x}}^{\mathbf{2}}}-\mathbf{5x}+\mathbf{6},\]\[{{\mathbf{x}}^{\mathbf{2}}}-\mathbf{7x}+\mathbf{12}\] and \[{{\mathbf{x}}^{\mathbf{2}}}+\mathbf{9x}+\mathbf{20}\]

What is the HCF of \[{{\mathbf{x}}^{\mathbf{2}}}-\mathbf{5x}+\mathbf{6

1.	What is the HCF of \[{{\mathbf{x}}^{\mathbf{2}}}-\mathbf{5x}+\mathbf{6},\]\[{{\mathbf{x}}^{\mathbf{2}}}-\mathbf{7x}+\mathbf{12}\] and \[{{\mathbf{x}}^{\mathbf{2}}}+\mathbf{9x}+\mathbf{20}\]
A.	1
B.	\[\left( x-3 \right)\]
C.	\[\left( 2x-5 \right)\]
D.	\[x-4\]
Answer» B. \[\left( x-3 \right)\]

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What is the HCF of \[{{\mathbf{x}}^{\mathbf{2}}}-\mathbf{5x}+\mathbf{6},\]\[{{\mathbf{x}}^{\mathbf{2}}}-\mathbf{7x}+\mathbf{12}\] and \[{{\mathbf{x}}^{\mathbf{2}}}+\mathbf{9x}+\mathbf{20}\]

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