Which of the following equations represents the graph above?

  • A \(y = 2+7x+4x^2\)
  • B \(y = 2-7x+4x^2\)
  • C \(y = 2+7x-4x^2\)
  • D \(y = 2-7x-4x^2\)
jamb 2009mathematics

The correct answer is D. \(y = 2-7x-4x^2\)

x = -2 and x = 1/4

x = -2 and 4x = 1

x+2 and 4x-1

(x+2)(4x-1) = 0

4x2 - x + 8x -2 = 0

4x2 + 7x – 2 = 0 but y intercept is positive. Multiply the equation by -1

-4x2 - 7x + 2 = 0

∴y = 2 – 7x – 4x2

Previous question Next question