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The expression is 4a + 2b + a.

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= 4a + a + 2b                            (Commutative Property: a + b = b + a)

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= (4a + a) + 2b                         (Associative Property: (a + b) + c = a + (b + c))

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= (4 + 1)a + 2b                         (Distributive property: a (b + c) = ab + ac)

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= 5a + 2b                                  (Add: 4 + 1  = 5)

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The value of the expression is 5a + 2b

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