BINARY OPERATIONS 2

If p*k = 4pk + p – 2k; find 7*2.

Solution

p*k = (4 x p x k) + p – (2xk)   [rewriting the given expression more clearly]

7*2 = (4 x 7 x 2) + 7 – (2x2)   [substituting 7 for p and 2 for k]

7*2 = 56 + 7 – 4

7*2 = 63 – 4   [we add first before subtracting]

7*2 = 59.

Hence   7*2 = 59.

  

 TRY THIS........

  

If p*k = 2p - k – 5pk; find 3*-3.