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
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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