JAMB - Mathematics (2022 - No. 32)
Let (*) be a binary operation on a natural number defined by a * b = a - b + (ab)\(^2\), then find 3 * 5
223
232
32
-232
คำอธิบาย
3 * 5 = 3 - 5 + (3 x 5)\(^2\)
-2 + (15)\(^2\)
-2 + 225
= 223
3 * 5 = 3 - 5 + (3 x 5)\(^2\)
-2 + (15)\(^2\)
-2 + 225
= 223