What is the equation of the quadratic function represented by the graph?
 

  • A y = x² + x - 2
  • B y = -x² - x + 2
  • C y = x² - x - 2
  • D y = -x² - x + 2
jamb 1990mathematics

The correct answer is C. y = x² - x - 2

The required equation is y = x²

i.e. B where the graph touches the graph touches the x-axis y = 0

x²- x - 2 = 0 = (x + 1)(x - 2) = 0

Hence roots of the equation are -1 and 2 as shown in the graph

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