WAEC - Mathematics (2016 - No. 42)
The relation y = x2 + 2x + k passes through the point (2,0). Find the value of k
- 8
- 4
4
8
Explicació
Y = x2 + 2x + k (given)
y = o when x = 2
thus 0 = 22 + 2 x 2 + k
0 = 4 + 4 + k
given k = -8
y = o when x = 2
thus 0 = 22 + 2 x 2 + k
0 = 4 + 4 + k
given k = -8