Let, k ˆ j ˆ 2 i ˆ a − + α = → and k ˆ j ˆ i ˆ 2 b + α + − = → , where α∈ R . If the area of the parallelogram whose adjacent sides are represented by the vectors → a and → b is ) 4 ( 15 2 + α , then the value of 2 2 | b | ) b a ( | a | 2 → → → → ⋅ + is equal to :

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Let, k ˆ j ˆ 2 i ˆ a − + α = → and k ˆ j ˆ i ˆ 2 b + α + − = → , where α∈ R . If the area of the parallelogram whose adjacent sides are represented by the vectors → a and → b is ) 4 ( 15 2 + α , then the value of 2 2 | b | ) b a ( | a | 2 → → → → ⋅ + is equal to :

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