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At what real value of x do the curves whose equations are y = x3...

Mathematics
JAMB 1985

At what real value of x do the curves whose equations are y = x3 + x and y = x2 + 1 intersect?
  • A. -2
  • B. 2
  • C. -1
  • D. 9
  • E. 1
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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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