Question

factorise 3x^2-x-4. please !!!!

Answer 1

Answer:

=3x²-x-4

=3x²-(4-3)x-4

=3x²-4x+3x-4

=x(3x-4)+1(3x-4)

=(3x-4)(x+1)

follow me

Answer 2

$= \sf{ {3x}^{2} - x - 4} \\ = \sf{ {3x}^{2} - 4x + 3x - 4} \\ = \sf \: x(3x - 4) \: + 1(3x - 4) \\ = \sf \: (x + 1) \: (3x - 4)$

$\sf\orange{Answer\:is (x + 1) \: (3x - 4)}$