Mathematics
Grade10
Easy

Question

Factorise 2x2 + 7x – 4

  1. (2x + 4)(x – 1) 
  2. (2x – 1)(x + 4)
  3. (2x + 5)(2x – 3)
  4. (x – 4)(2x + 3)

The correct answer is: (2x – 1)(x + 4)


    (2x2 + 7x - 4)
    a = 2, b = 7, c = -4
    ab = -8,
    Factors of -8 are 8 and -1.
    8 + (-1) = 7
    2x² +8x -x -4 =0
    2x(x+4) -1(x+4)
    (x + 4)(2x – 1)

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