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JAMB Mathematics 2010 Paper

Question : 7

Total: 49

x * y=x+y^2

, find then value of (2*3)*5

Solution:

Concept:

Use the given operation rule

x * y = x + y^2

twice, starting with the bracket.

Explanation:

First, evaluate

2 * 3

2 * 3 = 2 + 3^2

= 2 + 9

= 11

Now substitute this value into the remaining expression.

(2 * 3) * 5 = 11 * 5

= 11 + 5^2

= 11 + 25

= 36

Answer:

36

Thus, the correct option is A. 36.

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