20
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no. 6x8 =48. 5x4 + 1x4 =20 + 4 =24.
5x4 - 2x = x*(5x3 - 2) and that cannot be factorised further without invoking surds.
the product of 5x4 because 5x4=20 and 5+4=9
Not sure what "would not work" in this case. The corresponding commutative property states that 5x4 is the same as 4x5.
5X4=20