JAMB - Mathematics (2002 - No. 20)
If -2 is the solution of the equation 2x + 1 - 3c = 2c + 3x - 7, find the value of c.
4
3
2
1
Explicació
-2 is the solution implies x = -2.
2x + 1 - 3c = 2c + 3x - 7
2(-2) + 1 - 3c = 2c + 3(-2) - 7
-4 + 1 - 3c = 2c - 6 - 7
-3 + 13 = 2c + 3c \(\implies\) c = 2.