JAMB - Mathematics (2013 - No. 17)
If a binary operation * is defined by x * y = x + 2y, find 2 * (3 * 4)
24
16
14
26
Vysvětlení
x * y = x + 2y (given)
3 * 4 = 3 + 2(4) = 11
Hence, 2 * (3 * 4) = 2 * 11
= 2 + 2(11)
= 2 + 22
= 24
3 * 4 = 3 + 2(4) = 11
Hence, 2 * (3 * 4) = 2 * 11
= 2 + 2(11)
= 2 + 22
= 24