JAMB - Mathematics (2017 - No. 38)
The operation * on the set R of real number is defined by x * y = 3x + 2y − 1, find 3* − 1
9
- 9
6
- 6
Explanation
x * y is an operation on 3x + 2y − 1
Find 3A − 1
x = 3, y = −1
3 * − 1 on 3x + 2y − 1
3(3) + 2(−1) −1
= 9 − 2 − 1
= 6
Find 3A − 1
x = 3, y = −1
3 * − 1 on 3x + 2y − 1
3(3) + 2(−1) −1
= 9 − 2 − 1
= 6
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