Question on: JAMB Mathematics - 2010
If x (\ast) y = x + y2, find the value of (2 (\ast) 3)(\ast)5
A
25
B
11
C
55
D
36
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Correct Option: D
Given that,
X (\ast) y = X + y2
(2 (\ast) 3) (\ast) 5 = (2 + 32)(\ast)5
= (2 + 9)(\ast)5 = 11 (\ast)5
Hence 11 (\ast) 5 = 11 + 52
= 11 + 25 = 36
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