If ∆ is an operation on integers such that a ∆ b = a − b − 2, for all integers a, b. Then, 7 ∆ (− 4) =

(a) 11 (b) − 9 (c) 9 (d) 1

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Solution

Here, the operation ∆ is defined as a ∆ b = a − b − 2. So
7 ∆ (− 4) = 7 − (− 4) − 2
= 7 + 4 − 2
= 11 − 2
= 9
Hence, the correct option is (c).

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If ∆ is an operation on integers such that a ∆ b = a − b − 2, for all integers a, b. Then, 7 ∆ (− 4) = (a) 11 (b) − 9 (c) 9 (d) 1

Here, the operation ∆ is defined as a ∆ b = a − b − 2. So 7 ∆ (− 4) = 7 − (− 4) − 2 = 7 + 4 − 2 = 11 − 2 = 9 Hence, the correct option is (c).

If ∆ is an operation on integers such that a ∆ b = a − b − 2, for all integers a, b. Then, 7 ∆ (− 4) =

(a) 11 (b) − 9 (c) 9 (d) 1

Here, the operation ∆ is defined as a ∆ b = a − b − 2. So
7 ∆ (− 4) = 7 − (− 4) − 2
= 7 + 4 − 2
= 11 − 2
= 9
Hence, the correct option is (c).