Question

factorise the polynomial 3x ^ 2 - x - 4

Answer 1

   

$3x^2-x-4 \\ \\ 3x^2+3x-4x-4 \\ \\ 3x(x+1)-4(x+1) \\ \\ \bold{(x+1)(3x-4)} \\ \\ \\ \therefore\ x=-1\ \ ; \ \ x=\frac{4}{3}$

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