The first thing to do is find the highest common factor (H.C.F) of \(10\) and \(4x\). This will tell us the term that will go outside the bracket. The Highest Common Factor (H.C.F.) = 2.
The factors of 6 are 1, 2, 3 and 6. The factors of 21 are 1, 3, 7 and 21. The HCF of 15, 6 and 21 is 3 When the expression includes a constant the highest common factor (HCF) is a number.
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