Mathematics
JAMB 1985
At what real value of x do the curves whose equations are y = x
3 + x and y = x
2 + 1 intersect?
-
A.
-2
-
B.
2
-
C.
-1
-
D.
9
-
E.
1
Correct Answer: Option E
Explanation
y = x3 + x and y = x2 + 1
\(\begin{array}{c|c} x & -2 & -1 & 0 & 1 & 2 \\ \hline Y = x^3 + x & -10 & -2 & 0 & 2 & 10 \\ \hline y = x^2 + 1 & 5 & 2 & 1 & 2 & 5\end{array}\)
The curves intersect at x = 1
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