JAMB - Mathematics (1993 - No. 10)
If \(\sqrt{x^2 + 9}\) = x + 1, solve for x
5
4
3
2
1
Uitleg
\(\sqrt{x^2 + 9}\) = x + 1
x2 + 9 = (x + 1)2 + 1
0 = x2 + 2x + 1 - x2 - 9
= 2x - 8 = 0
2(x - 4) = 0
x = 4
x2 + 9 = (x + 1)2 + 1
0 = x2 + 2x + 1 - x2 - 9
= 2x - 8 = 0
2(x - 4) = 0
x = 4