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The graphical method of solving the equation x3 + 3x2 + 4x - 28 =...

Mathematics
JAMB 1982

The graphical method of solving the equation x3 + 3x2 + 4x - 28 = 0 is by drawing the graphs of the curves

  • A. y = x3 and y = 3x2 + x - 28
  • B. y = x3 + 3x2 + 4x + 4 and the line y = \(\frac{28}{x}\)
  • C. y = x3 + 3x2 + 4x and y
  • D. y = x2 + 3x + 4 and y = \(\frac{28}{x}\)
  • E. y = x2 + 3x + 4 and line y = 28x
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Correct Answer: Option D
Explanation

The graphical method of solving the equation x3 + 3x2 + 4x - 28 = 0 is by drawing the graphs of the curves

y = x2 + 3x + 4 and y = \(\frac{28}{x}\)`.


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