Question

Factorise this please

Answer 1

3x^2 -x-4

= 3x^2 -4x+3x-4
= 3x(x+1) -4(x+1)
= (3x-4)(x+1)

Hope this helps.

Answer 2

YOUR SOLUTION....

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$3 {x}^{2} - x - 4 \\ 3 {x}^{2} - (4 - 3)x - 4 \\ 3 {x}^{2} - 4x + 3x - 4 \\ x(3x - 4) + 1(3x - 4) \\ (3x - 4) \: (x + 1) \\ = > 3x - 4 = 0 \\ = > 3x = 4 \\ = > x = \frac{4}{3} \\ = > x + 1 = 0 \\ = > x = - 1$
FULLY SOLVED IT••••••••••••