BINARY OPERATIONS 1

If p*k = pk + p – 2k; find 7*2.

Solution

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

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

7*2 = 14 + 7 – 4

7*2 = 21 – 4   [we add first before subtracting]

7*2 = 17.

Hence   7*2 = 17.

 TRY THIS........

If p*k = p - k – pk; find 8*-3.