Question

Factor completely 2x2 – X – 4.

(3x - 1)(x + 4)
(3x + 4)(x - 1)
(3x − 2)(x + 2)
-
(3x – 4)(x + 1)
-

Answer 1

`2x {}^(2) - x - 4`

`x = ( - ( - 1) + √(1 - 4(2)( - 4)) )/(2(2)) = (1 + √(33) )/(4)`

`x = (1 - √(33) )/(4)`

`(x - (1 + √(33) )/(4) )(x - (1 - √(33) )/(4) )`

`(4x - 1 - √(33) )(4x - 1 + √(33) )`